Garry Newman has been hard at work integrating Kinect into Garry's Mod, the frequently hilarious Source Engine toolkit. Within a fortnight, users will be able to directly control character limbs by moving their own, which should lead to plenty more odd videos hitting YouTube in the near future. It will also work in multiplayer, and I'm struggling to find a single word that sums up just how exciting and worrying that is.
The embedded video shows some of the Kinect-controlled characters in action, though it's the end product of plenty of hard graft. Head over to Newman's blog for more details.