Stream from Vista PC using a PS3 and TVersity software
I hooked up a PS3 to my network and stream content (video, music, photos) from my HP Vista PC to my televisions using TVersity Media Server software. Windows media centre software is useless, so it is best to use TVersity, a free shareware program. TVersity easily streams content to the PS3, which has an excellent interface for browsing all the media files on your computer's hard drives.
Plus, the PS3 has a blu ray player, so you pay $400 for a wireless media extender (no need to run a network cable from your office to your tv), a blu ray player, and a game console. Even if you never play games, it's the best media extender platform value available because of the blu ray player.
Check out the TVersity website for PS3 connectivity. Even if you choose another media extender (XBox, Lynksis, ect.) make sure you use TVersity as your media server. I eveb use to stream content to my iPhone when out and about.