Finally, another important advantage is that the Kinect cameras are capable of recording video, as well. So you can actually use them for video chat. Also, the fact that face recognition is built will be a nice bonus for certain users.
a very interesting aspect of the Xbox Kinect to detect objects as well. This means that you can integrate the actual, real world objects into your gameplay experience. It is not difficult to imagine game developers selling games with the sword or the ball to add to the experience the players have.