Ryan Challinor, creator of Synapse for Kinect, has developed another great little side project in his free time. This time around he's created a Kinect controlled BeatWheel that controls a looping sample by using gestures to play the track normally or in reverse. You'll need to download the Max patch and the Synapse for Kinect application for Mac in order to try it out for your self. Be sure to read the README file for any further instructions regarding the set-up process.
Check out his Music Hack Day page for updates and a kick ass animated gif of the developer (Ryan) trying out the Kinect BeetWheel in action!