Cool Kinect hack: Sound board
Seriously. This guy's got chops.
Not only to be able to hack a Kinect and create a sort of sound board, but to be able to conceive of this idea in the first place. Garratt Gallagher from M.I.T. really gets what possibilities something like the Kinect can offer if you just have out-of-the-box imagination, some time and technical know-how to explore what "could be" with Kinect.