Wave Your Hands In The Air: Kinect SDK
The Kinect for Windows SDK beta is up, and a bright shiny future of PC motion tracking begins! I'm looking forward to "Slumped In A Chair, Twitching A Bit," novelty pointing games, and other exciting motion-tracking experiences you can have at your PC. Hopefully there will also be a version of that Milo thing where you can make friends with a childish Space Marine.
Relatedly, I've posted a video of Kinect running in Unity below, because I really like the visuals. (That's what I used to illustrate this post.)