For reading, and discussion:
1 Billion Entertainment Hours spent on Xbox LIVE every month
We’ve just released some interesting Xbox data that I thought you might enjoy: And when we ship the next dashboard update in the very near future, Xbox LIVE will launch ESPN on Xbox LIVE, along with Video Kinect.
http://majornelson.com/archive/2010/10/29/1-billion-entertainment-hours-spent-on-xbox-live-every-month.aspx