Adding a couple of Servo examples from Wiring (slightly modified).

hardware/libraries/Servo/examples/Knob/Knob.pde

@@ -0,0 +1,22 @@
+// Controlling a servo position using a potentiometer (variable resistor) 
+// by Michal Rinott <http://people.interaction-ivrea.it/m.rinott> 
+
+#include <Servo.h> 
+ 
+Servo myservo;  // create servo object to control a servo 
+ 
+int potpin = 0;  // analog pin used to connect the potentiometer
+int val;    // variable to read the value from the analog pin 
+ 
+void setup() 
+{ 
+  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
+} 
+ 
+void loop() 
+{ 
+  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023) 
+  val = map(val, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
+  myservo.write(val);                  // sets the servo position according to the scaled value 
+  delay(15);                           // waits for the servo to get there 
+}