Stream Videos on Your 360 Without Media Center

Finally, gamers can unleash all of their PC-canned porn onto their televisions. Reader Cainrok points out that Media Player 11 will support video playback from PC to Xbox 360 without the need of a Media Center Edition computer.

I'm fairly certain he's right. Looking at the site it specifically mentions streaming video onto your Xbox 360 and doesn't say a thing about a Media Center requirement.

...if you have an Xbox 360 or other digital media receiver (DMR), you can use Windows Media Player to stream music, pictures, and videos from your computer to that device.

This makes sense. Once Vista hits you won't need a Media Center system anyway, it will be built in, so why not make it work on XP as well.

Kotaku