Benjamin Heckendorn, over at benheck.com, has modded his Xbox 360 controller in a very interesting way. Why use both hands to control your 360 when you can do it with one? Benjamin made himself a single hand controller with some creative thinking and a spare wireless controller.
The controller features all buttons and rumble. The Right Stick is placed on the back of the device. You can use it while setting the controller on your knee and moving the controller against your leg.