We have featured quite a few different videos of Kinect hacks here at Geeky Gadgets, the latest one is this awesome Kinect virtual piano hack.
As you will see in the video below, the keyboard can be made into different sizes, depending on what space you have, and it can also be applied to a number of different surfaces.
The more and more I see of these Kinect hacks, the more amazing they get, this is definitely one of the coolest ones we have seen to date.
KinectHacks via Engadget, Boing Boing, Joystiq