The enterprising Dan Wilcox hacked his Kinect to see if it could spot his chest. "The computer searches for my manboobs and draws a bra or pasties on top," he writes in a description for a video of his experiment on his blog. "Music is played when titties are detected."
Note that Kinect isn't really tracking Dan's man-boobs the way it tracks, say, a person's hands. While the Kinect appears to locate a person's hands in space and then tracks their movement, Dan's description suggests that he's got the Kinect merely guessing at where his "breasts" are — "I look for a person-sized blob and use it's centroid to approximate a search box wherein to detect 2 boobs" — so it's not clear if Kinect can or would be able to track any jiggle.
Keep it clean, Kinect hackers!
Kinect Titty Tracker [Danomatika.com]