Kinectar lets you use your Kinect as a MIDI controller. This tutorial from Kinectar developer (Chris Vik) will show you how to use the basic functions of Kinectar’s main page. You’ll learn how to map your hands to control features in Ableton Live.
Same technique can be used for any software that accepts MIDI (ie. VJ Software). Mac OSX support in the coming days.
For a download link and all the links and information you need to get started, visit http://kinectar.org