An adjustable potentiometer can open up many interesting user interfaces. Turn the pot and the resistance changes. Connect VCC to an outer pin, GND to the other, and the center pin will have a voltage that varies from 0 to VCC depending on the rotation of the pot. Hook the center pin to an ADC on a microcontroller and get a variable input from the user!
This pot has a ¼" mounting diameter and has a 10K linear taper. Check the datasheet for dimensional drawings.
Rotary Potentiometer - 10k Ohm, Linear
We can get 2701 units in Australia from SparkFun.