I recently finished my Xbox 360 tilt controller mod.

As you might be able to tell by the name it allows you to use the tilt of the controller for your control in game. In this case the tilt of the controller takes over the left analog stick on the Xbox 360 controller. The tilt is determined using an accelerometer and is very smooth. It is identical to the tilt sensing technology in the Nintendo Wii remote.

You can get all of the juicy details at my site:

http://www.adamthole.com

A video of the unfinished version of the controller is available here:

http://www.metacafe.com/watch/392215...ler_phase_two/

The finished controller works the same as the controller seen in that video, but doesn't have the mess of wires.