Dunno how it works, but apparently as of Windows Media Player 11 beta 2 you can stream video to your Xbox360 - something which hasn't been possible up 'til now unless (like me) you have Windows XP Media Center Edition.

I'm sure Crucible will be interested in this, among others.

Update! From what I've read on the xbox.com forums, it looks like this will only be possible with an update to the Xbox360 dashboard ... so don't hold your breath. It might have been a bit premature on Microsoft's part to start talking about it this early.