I got a kinect last week (the first day they went on sale in New Zealand, as a matter of fact!). This is a first little hack to get my feet wet.
[Update]For them what's innerested, here's the source.
[Update 2]This effect was featured on New Scientist TV!
[Update 3]A few download links on the site are broken since I recently got some new hosting. I'll have them fixed in a day or two.