diff --git a/app/src/processing/app/Preferences.java b/app/src/processing/app/Preferences.java
index 06f48f2bf..640cb2e1f 100644
--- a/app/src/processing/app/Preferences.java
+++ b/app/src/processing/app/Preferences.java
@@ -139,7 +139,7 @@ public class Preferences {
                         "lv",
                         "lt",
                         "mr",
-                        "no",
+                        "no_nb",
                         "fa",
                         "pl",
                         "pt_br",
diff --git a/app/src/processing/app/SerialMonitor.java b/app/src/processing/app/SerialMonitor.java
index 6eebf539e..1f34e8f7e 100644
--- a/app/src/processing/app/SerialMonitor.java
+++ b/app/src/processing/app/SerialMonitor.java
@@ -127,10 +127,10 @@ public class SerialMonitor extends JFrame implements MessageConsumer {
     
     serialRates = new JComboBox();
     for (int i = 0; i < serialRateStrings.length; i++)
-      serialRates.addItem(serialRateStrings[i] + _(" baud"));
+      serialRates.addItem(serialRateStrings[i] + " " + _("baud"));
 
     serialRate = Preferences.getInteger("serial.debug_rate");
-    serialRates.setSelectedItem(serialRate + _(" baud"));
+    serialRates.setSelectedItem(serialRate + " " + _("baud"));
     serialRates.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent event) {
         String wholeString = (String) serialRates.getSelectedItem();
diff --git a/app/src/processing/app/Sketch.java b/app/src/processing/app/Sketch.java
index 3f19cd3a3..0293b622f 100644
--- a/app/src/processing/app/Sketch.java
+++ b/app/src/processing/app/Sketch.java
@@ -1369,6 +1369,9 @@ public class Sketch {
     for (SketchCode sc : code) {
       if (sc.isExtension("ino") || sc.isExtension("pde")) {
         sc.setPreprocOffset(bigCount);
+        // These #line directives help the compiler report errors with
+        // correct the filename and line number (issue 281 & 907)
+        bigCode.append("#line 1 \"" + sc.getFileName() + "\"\n");
         bigCode.append(sc.getProgram());
         bigCode.append('\n');
         bigCount += sc.getLineCount();
@@ -1541,54 +1544,16 @@ public class Sketch {
   public RunnerException placeException(String message, 
                                         String dotJavaFilename, 
                                         int dotJavaLine) {
-    int codeIndex = 0; //-1;
-    int codeLine = -1;
-
-//    System.out.println("placing " + dotJavaFilename + " " + dotJavaLine);
-//    System.out.println("code count is " + getCodeCount());
-
-    // first check to see if it's a .java file
-    for (int i = 0; i < getCodeCount(); i++) {
-      SketchCode code = getCode(i);
-      if (!code.isExtension(getDefaultExtension())) {
-        if (dotJavaFilename.equals(code.getFileName())) {
-          codeIndex = i;
-          codeLine = dotJavaLine;
-          return new RunnerException(message, codeIndex, codeLine);
-        }
-      }
-    }
-
-    // If not the preprocessed file at this point, then need to get out
-    if (!dotJavaFilename.equals(name + ".cpp")) {
-      return null;
-    }
-
-    // if it's not a .java file, codeIndex will still be 0
-    // this section searches through the list of .pde files
-    codeIndex = 0;
-    for (int i = 0; i < getCodeCount(); i++) {
-      SketchCode code = getCode(i);
-
-      if (code.isExtension(getDefaultExtension())) {
-//        System.out.println("preproc offset is " + code.getPreprocOffset());
-//        System.out.println("looking for line " + dotJavaLine);
-        if (code.getPreprocOffset() <= dotJavaLine) {
-          codeIndex = i;
-//          System.out.println("i'm thinkin file " + i);
-          codeLine = dotJavaLine - code.getPreprocOffset();
-        }
-      }
-    }
-    // could not find a proper line number, so deal with this differently.
-    // but if it was in fact the .java file we're looking for, though, 
-    // send the error message through.
-    // this is necessary because 'import' statements will be at a line
-    // that has a lower number than the preproc offset, for instance.
-//    if (codeLine == -1 && !dotJavaFilename.equals(name + ".java")) {
-//      return null;
-//    }
-    return new RunnerException(message, codeIndex, codeLine);
+     // Placing errors is simple, because we inserted #line directives
+     // into the preprocessed source.  The compiler gives us correct
+     // the file name and line number.  :-)
+     for (int codeIndex = 0; codeIndex < getCodeCount(); codeIndex++) {
+       SketchCode code = getCode(codeIndex);
+       if (dotJavaFilename.equals(code.getFileName())) {
+         return new RunnerException(message, codeIndex, dotJavaLine);
+       }
+     }
+     return null;
   }
 
 
diff --git a/app/src/processing/app/debug/Compiler.java b/app/src/processing/app/debug/Compiler.java
index 284550faa..c97a1c268 100644
--- a/app/src/processing/app/debug/Compiler.java
+++ b/app/src/processing/app/debug/Compiler.java
@@ -54,6 +54,7 @@ public class Compiler implements MessageConsumer {
 
   private PreferencesMap prefs;
   private boolean verbose;
+  private boolean sketchIsCompiled;
 	
   private RunnerException exception;
   
@@ -71,6 +72,7 @@ public class Compiler implements MessageConsumer {
       throws RunnerException {
     sketch = _sketch;
     verbose = _verbose;
+    sketchIsCompiled = false;
     objectFiles = new ArrayList<File>();
 
     prefs = createBuildPreferences(_buildPath, _primaryClassName);
@@ -87,6 +89,7 @@ public class Compiler implements MessageConsumer {
     // 1. compile the sketch (already in the buildPath)
     sketch.setCompilingProgress(30);
     compileSketch(includePaths);
+    sketchIsCompiled = true;
 
     // 2. compile the libraries, outputting .o files to: <buildPath>/<library>/
     // Doesn't really use configPreferences
@@ -339,10 +342,8 @@ public class Compiler implements MessageConsumer {
     boolean compiling = true;
     while (compiling) {
       try {
-        if (in.thread != null)
-          in.thread.join();
-        if (err.thread != null)
-          err.thread.join();
+        in.join();
+        err.join();
         result = process.waitFor();
         //System.out.println("result is " + result);
         compiling = false;
@@ -430,7 +431,7 @@ public class Compiler implements MessageConsumer {
       if (pieces[3].trim().equals("'Udp' was not declared in this scope")) {
         error = _("The Udp class has been renamed EthernetUdp.");
         msg = _("\nAs of Arduino 1.0, the Udp class in the Ethernet library " +
-              "has been renamed to EthernetClient.\n\n");
+              "has been renamed to EthernetUdp.\n\n");
       }
       
       if (pieces[3].trim().equals("'class TwoWire' has no member named 'send'")) {
@@ -455,14 +456,20 @@ public class Compiler implements MessageConsumer {
         //msg = _("\nThe 'Keyboard' class is only supported on the Arduino Leonardo.\n\n");
       }
       
-      RunnerException e = sketch.placeException(error, pieces[1], PApplet.parseInt(pieces[2]) - 1);
+      RunnerException e = null;
+      if (!sketchIsCompiled) {
+        // Place errors when compiling the sketch, but never while compiling libraries
+        // or the core.  The user's sketch might contain the same filename!
+        e = sketch.placeException(error, pieces[1], PApplet.parseInt(pieces[2]) - 1);
+      }
 
       // replace full file path with the name of the sketch tab (unless we're
       // in verbose mode, in which case don't modify the compiler output)
       if (e != null && !verbose) {
         SketchCode code = sketch.getCode(e.getCodeIndex());
-        String fileName = code.isExtension(sketch.getDefaultExtension()) ? code.getPrettyName() : code.getFileName();
-        s = fileName + ":" + e.getCodeLine() + ": error: " + pieces[3] + msg;        
+        String fileName = (code.isExtension("ino") || code.isExtension("pde")) ? code.getPrettyName() : code.getFileName();
+        int lineNum = e.getCodeLine() + 1;
+        s = fileName + ":" + lineNum + ": error: " + pieces[3] + msg;        
       }
             
       if (exception == null && e != null) {
diff --git a/app/src/processing/app/debug/MessageSiphon.java b/app/src/processing/app/debug/MessageSiphon.java
index 79a0920d5..12b1f993b 100644
--- a/app/src/processing/app/debug/MessageSiphon.java
+++ b/app/src/processing/app/debug/MessageSiphon.java
@@ -85,8 +85,15 @@ public class MessageSiphon implements Runnable {
     }
   }
   
-  
+  // Wait until the MessageSiphon thread is complete.
+  public void join() throws java.lang.InterruptedException {
+    // Grab a temp copy in case another thread nulls the "thread" 
+    // member variable
+    Thread t = thread;
+    if (t != null) t.join();
+  }
+
   public Thread getThread() {
     return thread;
-}
+  }
 }
diff --git a/app/src/processing/app/debug/Sizer.java b/app/src/processing/app/debug/Sizer.java
index 2de116cb2..89bfe5ee0 100644
--- a/app/src/processing/app/debug/Sizer.java
+++ b/app/src/processing/app/debug/Sizer.java
@@ -60,10 +60,8 @@ public class Sizer implements MessageConsumer {
       boolean running = true;
       while(running) {
         try {
-          if (in.thread != null)
-            in.thread.join();
-          if (err.thread != null)
-            err.thread.join();
+          in.join();
+          err.join();
           r = process.waitFor();
           running = false;
         } catch (InterruptedException intExc) { }
diff --git a/app/src/processing/app/preproc/PdePreprocessor.java b/app/src/processing/app/preproc/PdePreprocessor.java
index 2b4f03e85..4f848c922 100644
--- a/app/src/processing/app/preproc/PdePreprocessor.java
+++ b/app/src/processing/app/preproc/PdePreprocessor.java
@@ -205,7 +205,7 @@ public class PdePreprocessor {
     for (int i = 0; i < prototypes.size(); i++) {
       out.print(prototypes.get(i) + "\n");
     }
-    
+    out.println("#line 1");
     out.print(program.substring(prototypeInsertionPoint));
   }
 
diff --git a/app/src/processing/app/tools/Archiver.java b/app/src/processing/app/tools/Archiver.java
index cb282ed69..67c848a17 100755
--- a/app/src/processing/app/tools/Archiver.java
+++ b/app/src/processing/app/tools/Archiver.java
@@ -56,7 +56,7 @@ public class Archiver implements Tool {
     numberFormat.setGroupingUsed(false); // no commas
     numberFormat.setMinimumIntegerDigits(digits);
 
-    dateFormat = new SimpleDateFormat(_("yyMMdd"));
+    dateFormat = new SimpleDateFormat("yyMMdd");
   }
 
 
diff --git a/build/shared/examples/02.Digital/tonePitchFollower/tonePitchFollower.ino b/build/shared/examples/02.Digital/tonePitchFollower/tonePitchFollower.ino
index 2bdf0df26..e74c7b343 100644
--- a/build/shared/examples/02.Digital/tonePitchFollower/tonePitchFollower.ino
+++ b/build/shared/examples/02.Digital/tonePitchFollower/tonePitchFollower.ino
@@ -9,8 +9,8 @@
  * 4.7K resistor on analog 0 to ground
  
  created 21 Jan 2010
- modified 9 Apr 2012
- by Tom Igoe 
+ modified 31 May 2012
+ by Tom Igoe, with suggestion from Michael Flynn
 
 This example code is in the public domain.
  
@@ -29,10 +29,11 @@ void loop() {
   int sensorReading = analogRead(A0);
   // print the sensor reading so you know its range
   Serial.println(sensorReading);
-  // map the pitch to the range of the analog input.
+  // map the analog input range (in this case, 400 - 1000 from the photoresistor)
+  // to the output pitch range (120 - 1500Hz)
   // change the minimum and maximum input numbers below
   // depending on the range your sensor's giving:
-  int thisPitch = map(sensorReading, 400, 1000, 100, 1000);
+  int thisPitch = map(sensorReading, 400, 1000, 120, 1500);
 
   // play the pitch:
   tone(9, thisPitch, 10);
diff --git a/hardware/arduino/avr/cores/arduino/Print.cpp b/hardware/arduino/avr/cores/arduino/Print.cpp
index e541a6ce7..711251c8a 100755
--- a/hardware/arduino/avr/cores/arduino/Print.cpp
+++ b/hardware/arduino/avr/cores/arduino/Print.cpp
@@ -226,6 +226,9 @@ size_t Print::printFloat(double number, uint8_t digits)
 { 
   size_t n = 0;
   
+  if (isnan(number)) return print("nan");
+  if (isinf(number)) return print("inf");
+  
   // Handle negative numbers
   if (number < 0.0)
   {
diff --git a/hardware/arduino/avr/cores/arduino/Print.h b/hardware/arduino/avr/cores/arduino/Print.h
index 1af6b723f..dc7615087 100755
--- a/hardware/arduino/avr/cores/arduino/Print.h
+++ b/hardware/arduino/avr/cores/arduino/Print.h
@@ -46,7 +46,10 @@ class Print
     void clearWriteError() { setWriteError(0); }
   
     virtual size_t write(uint8_t) = 0;
-    size_t write(const char *str) { return write((const uint8_t *)str, strlen(str)); }
+    size_t write(const char *str) {
+      if (str == NULL) return 0;
+      return write((const uint8_t *)str, strlen(str));
+    }
     virtual size_t write(const uint8_t *buffer, size_t size);
     
     size_t print(const __FlashStringHelper *);
diff --git a/hardware/arduino/avr/cores/arduino/USBAPI.h b/hardware/arduino/avr/cores/arduino/USBAPI.h
index d5abdb690..eb2e5937d 100644
--- a/hardware/arduino/avr/cores/arduino/USBAPI.h
+++ b/hardware/arduino/avr/cores/arduino/USBAPI.h
@@ -39,6 +39,7 @@ public:
 	virtual int read(void);
 	virtual void flush(void);
 	virtual size_t write(uint8_t);
+	using Print::write; // pull in write(str) and write(buf, size) from Print
 	operator bool();
 };
 extern Serial_ Serial;
diff --git a/hardware/arduino/avr/cores/arduino/WInterrupts.c b/hardware/arduino/avr/cores/arduino/WInterrupts.c
index 8f3ec847f..62efc9cad 100644
--- a/hardware/arduino/avr/cores/arduino/WInterrupts.c
+++ b/hardware/arduino/avr/cores/arduino/WInterrupts.c
@@ -59,6 +59,14 @@ void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
 		EICRA = (EICRA & ~((1<<ISC10) | (1<<ISC11))) | (mode << ISC10);
 		EIMSK |= (1<<INT1);
 		break;	
+    case 2:
+        EICRA = (EICRA & ~((1<<ISC20) | (1<<ISC21))) | (mode << ISC20);
+        EIMSK |= (1<<INT2);
+        break;
+    case 3:
+        EICRA = (EICRA & ~((1<<ISC30) | (1<<ISC31))) | (mode << ISC30);
+        EIMSK |= (1<<INT3);
+        break;
 #elif defined(EICRA) && defined(EICRB) && defined(EIMSK)
     case 2:
       EICRA = (EICRA & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
@@ -147,12 +155,18 @@ void detachInterrupt(uint8_t interruptNum) {
     // ATmega8.  There, INT0 is 6 and INT1 is 7.)
     switch (interruptNum) {
 #if defined(__AVR_ATmega32U4__)
-	case 0:
-		EIMSK &= ~(1<<INT0);
-		break;
-	case 1:
-		EIMSK &= ~(1<<INT1);
-		break;		
+    case 0:
+        EIMSK &= ~(1<<INT0);
+        break;
+    case 1:
+        EIMSK &= ~(1<<INT1);
+        break;
+    case 2:
+        EIMSK &= ~(1<<INT2);
+        break;
+    case 3:
+        EIMSK &= ~(1<<INT3);
+        break;		
 #elif defined(EICRA) && defined(EICRB) && defined(EIMSK)
     case 2:
       EIMSK &= ~(1 << INT0);
@@ -226,6 +240,16 @@ SIGNAL(INT1_vect) {
 		intFunc[EXTERNAL_INT_1]();
 }
 
+SIGNAL(INT2_vect) {
+    if(intFunc[EXTERNAL_INT_2])
+		intFunc[EXTERNAL_INT_2]();
+}
+
+SIGNAL(INT3_vect) {
+    if(intFunc[EXTERNAL_INT_3])
+		intFunc[EXTERNAL_INT_3]();
+}
+
 #elif defined(EICRA) && defined(EICRB)
 
 SIGNAL(INT0_vect) {
diff --git a/hardware/arduino/avr/cores/arduino/wiring_private.h b/hardware/arduino/avr/cores/arduino/wiring_private.h
index f0ceb0cc4..026ce1a01 100755
--- a/hardware/arduino/avr/cores/arduino/wiring_private.h
+++ b/hardware/arduino/avr/cores/arduino/wiring_private.h
@@ -56,6 +56,8 @@ extern "C"{
 #define EXTERNAL_NUM_INTERRUPTS 8
 #elif defined(__AVR_ATmega1284P__) 
 #define EXTERNAL_NUM_INTERRUPTS 3
+#elif defined(__AVR_ATmega32U4__)
+#define EXTERNAL_NUM_INTERRUPTS 4
 #else
 #define EXTERNAL_NUM_INTERRUPTS 2
 #endif
diff --git a/hardware/arduino/avr/libraries/SD/utility/Sd2PinMap.h b/hardware/arduino/avr/libraries/SD/utility/Sd2PinMap.h
index 4bd75a35d..1c76dd3a4 100644
--- a/hardware/arduino/avr/libraries/SD/utility/Sd2PinMap.h
+++ b/hardware/arduino/avr/libraries/SD/utility/Sd2PinMap.h
@@ -166,44 +166,43 @@ static const pin_map_t digitalPinMap[] = {
 };
 //------------------------------------------------------------------------------
 #elif defined(__AVR_ATmega32U4__)
-// Teensy 2.0
+// Leonardo
 
 // Two Wire (aka I2C) ports
-uint8_t const SDA_PIN = 6;
-uint8_t const SCL_PIN = 5;
+uint8_t const SDA_PIN = 2;
+uint8_t const SCL_PIN = 3;
 
 // SPI port
-uint8_t const SS_PIN = 0;
-uint8_t const MOSI_PIN = 2;
-uint8_t const MISO_PIN = 3;
-uint8_t const SCK_PIN = 1;
+uint8_t const SS_PIN = 17;
+uint8_t const MOSI_PIN = 16;
+uint8_t const MISO_PIN = 14;
+uint8_t const SCK_PIN = 15;
 
 static const pin_map_t digitalPinMap[] = {
-  {&DDRB, &PINB, &PORTB, 0},  // B0  0
-  {&DDRB, &PINB, &PORTB, 1},  // B1  1
-  {&DDRB, &PINB, &PORTB, 2},  // B2  2
-  {&DDRB, &PINB, &PORTB, 3},  // B3  3
-  {&DDRB, &PINB, &PORTB, 7},  // B7  4
-  {&DDRD, &PIND, &PORTD, 0},  // D0  5
-  {&DDRD, &PIND, &PORTD, 1},  // D1  6
-  {&DDRD, &PIND, &PORTD, 2},  // D2  7
-  {&DDRD, &PIND, &PORTD, 3},  // D3  8
-  {&DDRC, &PINC, &PORTC, 6},  // C6  9
-  {&DDRC, &PINC, &PORTC, 7},  // C7 10
-  {&DDRD, &PIND, &PORTD, 6},  // D6 11
-  {&DDRD, &PIND, &PORTD, 7},  // D7 12
-  {&DDRB, &PINB, &PORTB, 4},  // B4 13
-  {&DDRB, &PINB, &PORTB, 5},  // B5 14
-  {&DDRB, &PINB, &PORTB, 6},  // B6 15
-  {&DDRF, &PINF, &PORTF, 7},  // F7 16
-  {&DDRF, &PINF, &PORTF, 6},  // F6 17
-  {&DDRF, &PINF, &PORTF, 5},  // F5 18
-  {&DDRF, &PINF, &PORTF, 4},  // F4 19
-  {&DDRF, &PINF, &PORTF, 1},  // F1 20
-  {&DDRF, &PINF, &PORTF, 0},  // F0 21
-  {&DDRD, &PIND, &PORTD, 4},  // D4 22
-  {&DDRD, &PIND, &PORTD, 5},  // D5 23
-  {&DDRE, &PINE, &PORTE, 6}   // E6 24
+  {&DDRD, &PIND, &PORTD, 2},  // D2  0
+  {&DDRD, &PIND, &PORTD, 3},  // D3  1
+  {&DDRD, &PIND, &PORTD, 1},  // D1  2
+  {&DDRD, &PIND, &PORTD, 0},  // D0  3
+  {&DDRD, &PIND, &PORTD, 4},  // D4  4
+  {&DDRC, &PINC, &PORTC, 6},  // C6  5
+  {&DDRD, &PIND, &PORTD, 7},  // D7  6
+  {&DDRE, &PINE, &PORTE, 6},  // E6  7
+  {&DDRB, &PINB, &PORTB, 4},  // B4  8
+  {&DDRB, &PINB, &PORTB, 5},  // B5  9
+  {&DDRB, &PINB, &PORTB, 6},  // B6 10
+  {&DDRB, &PINB, &PORTB, 7},  // B7 11
+  {&DDRD, &PIND, &PORTD, 6},  // D6 12
+  {&DDRC, &PINC, &PORTC, 7},  // C7 13
+  {&DDRB, &PINB, &PORTB, 3},  // B3 14
+  {&DDRB, &PINB, &PORTB, 1},  // B1 15
+  {&DDRB, &PINB, &PORTB, 2},  // B2 16
+  {&DDRB, &PINB, &PORTB, 0},  // B0 17
+  {&DDRF, &PINF, &PORTF, 7},  // F7 18
+  {&DDRF, &PINF, &PORTF, 6},  // F6 19
+  {&DDRF, &PINF, &PORTF, 5},  // F5 20
+  {&DDRF, &PINF, &PORTF, 4},  // F4 21
+  {&DDRF, &PINF, &PORTF, 1},  // F1 22
+  {&DDRF, &PINF, &PORTF, 0},  // F0 23
 };
 //------------------------------------------------------------------------------
 #elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
diff --git a/hardware/arduino/avr/libraries/SPI/SPI.cpp b/hardware/arduino/avr/libraries/SPI/SPI.cpp
index 42915df1e..5e48073f7 100644
--- a/hardware/arduino/avr/libraries/SPI/SPI.cpp
+++ b/hardware/arduino/avr/libraries/SPI/SPI.cpp
@@ -14,27 +14,32 @@
 SPIClass SPI;
 
 void SPIClass::begin() {
-  // Set direction register for SCK and MOSI pin.
-  // MISO pin automatically overrides to INPUT.
+
+  // Set SS to high so a connected chip will be "deselected" by default
+  digitalWrite(SS, HIGH);
+
   // When the SS pin is set as OUTPUT, it can be used as
   // a general purpose output port (it doesn't influence
   // SPI operations).
-
-  pinMode(SCK, OUTPUT);
-  pinMode(MOSI, OUTPUT);
   pinMode(SS, OUTPUT);
-  
-  digitalWrite(SCK, LOW);
-  digitalWrite(MOSI, LOW);
-  digitalWrite(SS, HIGH);
 
-  // Warning: if the SS pin ever becomes a LOW INPUT then SPI 
-  // automatically switches to Slave, so the data direction of 
+  // Warning: if the SS pin ever becomes a LOW INPUT then SPI
+  // automatically switches to Slave, so the data direction of
   // the SS pin MUST be kept as OUTPUT.
   SPCR |= _BV(MSTR);
   SPCR |= _BV(SPE);
+
+  // Set direction register for SCK and MOSI pin.
+  // MISO pin automatically overrides to INPUT.
+  // By doing this AFTER enabling SPI, we avoid accidentally
+  // clocking in a single bit since the lines go directly
+  // from "input" to SPI control.  
+  // http://code.google.com/p/arduino/issues/detail?id=888
+  pinMode(SCK, OUTPUT);
+  pinMode(MOSI, OUTPUT);
 }
 
+
 void SPIClass::end() {
   SPCR &= ~_BV(SPE);
 }
diff --git a/hardware/arduino/avr/libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino b/hardware/arduino/avr/libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino
index 69bcc01a1..6101bb1ad 100644
--- a/hardware/arduino/avr/libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino
+++ b/hardware/arduino/avr/libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino
@@ -5,11 +5,20 @@
  Receives from software serial, sends to hardware serial.
  
  The circuit: 
- * RX is digital pin 2 (connect to TX of other device)
- * TX is digital pin 3 (connect to RX of other device)
+ * RX is digital pin 10 (connect to TX of other device)
+ * TX is digital pin 11 (connect to RX of other device)
+ 
+ Note:
+ Not all pins on the Mega and Mega 2560 support change interrupts, 
+ so only the following can be used for RX: 
+ 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69
+ 
+ Not all pins on the Leonardo support change interrupts, 
+ so only the following can be used for RX: 
+ 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).
  
  created back in the mists of time
- modified 9 Apr 2012
+ modified 25 May 2012
  by Tom Igoe
  based on Mikal Hart's example
  
@@ -18,17 +27,17 @@
  */
 #include <SoftwareSerial.h>
 
-SoftwareSerial mySerial(2, 3); // RX, TX
+SoftwareSerial mySerial(10, 11); // RX, TX
 
 void setup()  
 {
- // Open serial communications and wait for port to open:
+  // Open serial communications and wait for port to open:
   Serial.begin(57600);
-   while (!Serial) {
+  while (!Serial) {
     ; // wait for serial port to connect. Needed for Leonardo only
   }
 
-  
+
   Serial.println("Goodnight moon!");
 
   // set the data rate for the SoftwareSerial port
@@ -43,3 +52,4 @@ void loop() // run over and over
   if (Serial.available())
     mySerial.write(Serial.read());
 }
+
diff --git a/hardware/arduino/avr/libraries/SoftwareSerial/examples/TwoPortReceive/TwoPortReceive.ino b/hardware/arduino/avr/libraries/SoftwareSerial/examples/TwoPortReceive/TwoPortReceive.ino
index d9f8f453f..d607ee622 100644
--- a/hardware/arduino/avr/libraries/SoftwareSerial/examples/TwoPortReceive/TwoPortReceive.ino
+++ b/hardware/arduino/avr/libraries/SoftwareSerial/examples/TwoPortReceive/TwoPortReceive.ino
@@ -16,8 +16,17 @@
  * First serial device's TX attached to digital pin 2, RX to pin 3
  * Second serial device's TX attached to digital pin 4, RX to pin 5
  
+ Note:
+ Not all pins on the Mega and Mega 2560 support change interrupts, 
+ so only the following can be used for RX: 
+ 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69
+ 
+ Not all pins on the Leonardo support change interrupts, 
+ so only the following can be used for RX: 
+ 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).
+ 
  created 18 Apr. 2011
- modified 9 Apr 2012
+ modified 25 May 2012
  by Tom Igoe
  based on Mikal Hart's twoPortRXExample
  
@@ -26,11 +35,12 @@
  */
 
 #include <SoftwareSerial.h>
-// software serial #1: TX = digital pin 2, RX = digital pin 3
-SoftwareSerial portOne(2, 3);
+// software serial #1: TX = digital pin 10, RX = digital pin 11
+SoftwareSerial portOne(10,11);
 
-// software serial #2: TX = digital pin 4, RX = digital pin 5
-SoftwareSerial portTwo(4, 5);
+// software serial #2: TX = digital pin 8, RX = digital pin 9
+// on the Mega, use other pins instead, since 8 and 9 don't work on the Mega
+SoftwareSerial portTwo(8,9);
 
 void setup()
 {
diff --git a/hardware/arduino/sam/cores/arduino/Print.cpp b/hardware/arduino/sam/cores/arduino/Print.cpp
index 123370f4d..4a21176cf 100644
--- a/hardware/arduino/sam/cores/arduino/Print.cpp
+++ b/hardware/arduino/sam/cores/arduino/Print.cpp
@@ -219,6 +219,9 @@ size_t Print::printFloat(double number, uint8_t digits)
 { 
   size_t n = 0;
   
+  if (isnan(number)) return print("nan");
+  if (isinf(number)) return print("inf");
+  
   // Handle negative numbers
   if (number < 0.0)
   {
diff --git a/hardware/arduino/sam/cores/arduino/Print.h b/hardware/arduino/sam/cores/arduino/Print.h
index 1af6b723f..dc7615087 100644
--- a/hardware/arduino/sam/cores/arduino/Print.h
+++ b/hardware/arduino/sam/cores/arduino/Print.h
@@ -46,7 +46,10 @@ class Print
     void clearWriteError() { setWriteError(0); }
   
     virtual size_t write(uint8_t) = 0;
-    size_t write(const char *str) { return write((const uint8_t *)str, strlen(str)); }
+    size_t write(const char *str) {
+      if (str == NULL) return 0;
+      return write((const uint8_t *)str, strlen(str));
+    }
     virtual size_t write(const uint8_t *buffer, size_t size);
     
     size_t print(const __FlashStringHelper *);
diff --git a/hardware/arduino/sam/cores/arduino/USB/USBAPI.h b/hardware/arduino/sam/cores/arduino/USB/USBAPI.h
index 0026682c5..fb2baa3d7 100644
--- a/hardware/arduino/sam/cores/arduino/USB/USBAPI.h
+++ b/hardware/arduino/sam/cores/arduino/USB/USBAPI.h
@@ -57,6 +57,7 @@ public:
 	virtual int read(void);
 	virtual void flush(void);
 	virtual size_t write(uint8_t);
+	using Print::write; // pull in write(str) and write(buf, size) from Print
 	operator bool();
 };
 extern Serial_ Serial;