Sacado de xbox-scene:
Stream Video from XP to Xbox 360 with WMP 11? (not yet, maybe this fall)
>> Windows Media Player 11 beta2 is now available and this is what the Microsoft PR writes as one of the new features:
"If you have a home network (wired or wireless), you can use Windows Media Player 11 to stream the contents of your library to networked devices. For example, 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."
Sounds great ... will Microsoft finally allow us to stream movies from a normal Windows XP machine and stop forcing Media Center PC on us? Well ... right now it doesn't work.
WMP 11 beta2 does have Windows Media Connect built in, which allows to stream pictures and music to your Xbox 360, but video is still a no-go.
Some sites suggest there will be an Xbox 360 dashboard update (the big fall 06 update maybe?) to allow streaming videos from WMP 11, but right now there's no official confirmation from Microsoft about this.