well i know that wxp media center edition if for media center pc's not regular pc's,they come with a dvr to record shows from tv and media center edition can also be used to watch live tv on pc and also archives pictures and videos for you.
Media Center edition? Hmmmm... for the DVD/music go'er I guess.
I just got a beta of Longhorn (100% legally BTW), so I'm going to be playing with that some after I install it tomorrow... er... later today. Also toying around with Visual Studio 2005... now only if I knew how to program, heh heh.