The only limit to the applications Kinect can be put to is imagination. The more of it you have, the more things you can use the peerless Xbox 360 peripheral to achieve. To wit, some eager chaps have put together the Keyboard Anywhere hack, which employs a little Python and the libfreenect library to offer up a piano keyboard on any flat surface of almost any size. You can practice your Mozart concertos on a desk, or, as they so ably demonstrate, imagine yourself as a young Tom Hanks skipping along on the FAO Schwarz floor piano in the movie Big. It's all up to you.