"Synapse is an app for Mac and Windows that allows you to easily use your Kinect to control Ableton Live, Quartz Composer, Max/MSP, and any other application that can receive OSC events. It sends joint positions and hit events via OSC, and also sends the depth image into Quartz Composer. In a way, this allows you to use your whole body as an instrument." Oooh. OSC into anything; really nice, dead simple, and exactly the sort of thing I've been considering poking.