The WiiChuck is an accessory attachment to the Nintendo Wii remote. This accessory has 3-axis accelerometers, a 2-axis joystick (thumb) and two buttons all interfaced via I2C. All this for about $20. There is code to work with the WiiChuck for the Arduino and these adaptors make it easy to get connection to the special connector used.
Maybe I could make the Arduino WiiChuck work with some of Bernard’s code from the Accelerometer Based Mouse article.