I got myself a kinect to play around with. I decided to hook it up to a usb rocket launcher that I had lying around. I did it with a little bit of python, libfreenect and pyrocket. And no comments about the video editing - that was WAY more difficult for me than the hack itself!

The source code is on github:
https://github.com/jwagner/kinect-experiments

Oh, and thanks to my little brother Nils for filming. ;)