For a device that should be all about games, people are sure thinking up ways to use the Kinect for things like medicine and security. With security you might want to take a look at the following URLs:
In home paranoia: Kinect Long Term Privacy Issues Daunting?
A cover for your Kinect: Address Security and Privacy concerns around Kinect with the Pritect Sensor Cover
Direct source of helpful security information: Kinect Privacy and Online Safety FAQ
Kinect Security Algorithm: