This is a story published today, I'm not sure if it might be of interest regarding your question:
WINDOWS AND XBOX 360 TEAM UP FOR MEDIA ACTION
Stream multimedia around your house via Xbox 360 thanks to a new update for Windows XP Media Center Edition 2005. Well, when the console's released anyway
14:14 Anyone planning on snapping up Xbox 360 to take their home one step closer to interactive multimedia heaven might be interested by the news that Microsoft has released an update for Windows XP Media Center Edition 2005 that, in part, focuses on connectivity between the next-gen console and the operating system.
Sporting the catchy title Windows XP Media Center Edition 2005 Update Rollup 2, the update allows you to connect a Media Center PC to Xbox 360 and stream digital music, videos, photos and standard and high-definition television and movies from Media Center PCs to any television in your home via the next-gen machine. It's all possible thanks to Xbox 360's built-in Media Center Extender technology. Erm, great!
Windows XP Media Center 2005 users can obtain Update Rollup 2 for free via the Windows Update download site this minute. If only we had a Media Center PC, an Xbox 360 and five TVs then we'd be downloading it right now!