Most work was pretty derivative from Daniel Shiffman's work. Download his sources that I abuse liberally here: http://www.shiffman.net/2010/11/14/kinect-and-processing/
The 4 demos are as follows:
handTrack The basic single hand tracking demo
handDraw The one handed drawing demo
image The taco based minority report demo
c_kinect The demo of taking snapshots of people point clouds. This one gets a bit buggy in edit mode, but may still be fun to play with