I got this link: http://www.longhornblogs.com/robert/archive/2006/01/02/15590.aspx sent to me about Media Center not working in Community Tech Preview #3 for Vista.
Well this is lame and not fun but we are fixing it was we speak. An update will be out very shortly to fix the problem. If anyone is interested I'm happy to explain how this happened.
Needless to say this isn't a good way to start the new year.