Not bad for a simple experiment. Maybe even more interesting is how much one developer can do when supported by open source frameworks and libraries.
I sure hope this kind of "Kinect hacking" was Microsoft's original idea: watch the community come up with all kinds of crazy applications, and then use them in the next Xbox and blow everyone away.
I think Microsoft know's the resuts if it tries to stop the hacking of Kinect. Their own games are really not that engaging so far - this could help. I just hope they don't try some Apple move with development.
That's really clean. Good job and keep going. Also, you need air drums.
I think now with Kinect, the only limitation is your imagination...
he should mention that playing air instruments while listening to music, helps keep body, spirit and mind in shape. air instrument playing has health benefits. :-)