Stringer was built by the team of Aidan Feldman, Tyler Williams, and Alexander Chen in one weekend for Music Hackday in NYC, 2011. A string instrument performed through the Kinect 3d camera.
Source code: afeld.github.com/stringer/
Tyler Williams: fr.ac.tl/blog
Aidan Feldman: aidanfeldman.com
Alex Chen: chenalexander.com
A few more pictures here: http://bit.ly/gmiNJh