New Media Center Extenders...and they support DivX and XviD, something I've heard tons of people ask for. Good stuff:

So today Microsoft is announcing a reinvigorated Media Center Extender effort called... wait for it... Extenders for Windows Media Center. Ok, the name totally sucks, but the important part is Microsoft upgraded its wayward Extender system with a new version that takes full advantage of Vista (including live HDTV streaming), supports 802.11n, and adds something that really blew our mind: codecs we actually care about, namely XviD and DivX. Niveus, Linksys, and D-Link will all be launching new devices based on this software platform, so watch out for those -- as well as DVD players, TVs, and all manner of other home theater devices Microsoft is apparently trying to get this new system built right into. Unfortunately this new Extender rev isn't being announced for the Xbox 360 (yet), so we'll all have to wait a while longer before playing XviD and DivX movies on that thing -- without transcoding, anyway.

Microsoft debuts Extenders for Windows Media Center, adds DivX and XviD - Engadget