Hehehe, Johnny Lee (of Microsoft Kinect fame) was behind the Open Kinect bounty. Apparently he wanted PC support for it when he was working on the project at Microsoft, and management didn't. So he hatched a plan to get that technology into the hands of the people that might create awesome stuff with it, and with the help of the folks at Adafruit and a worldwide community of hackers, he showed the world just how cool NUI technology could be. Microsoft caught on, and has now announced a development kit for researchers and enthusiasts for Kinect on the PC this spring.
I'm excited for this.