I have been streaming HD movies to my xbox 360 for 2 months now and I would like to encourage people not to use this method. It is true that you can stream the wmv hd content to the 360 with wireless G but these movies are at a lower bitrate then the cool movie rips on the news groups from such places like alt.binaries.hdtv ect.. I bought and tried several MIMO and Pre N wireless routers and they really cant play the .TS movies with out puasing or stuttering. The bit rate is much higher in these extensions, for example the gladiator is 20 gigs! Now all is not lost here. A wireless G connection is only gonna allow about a 15 - 25 mbit throughput depending how close the router is to the unit, I know they say wireless G does 54 but I have tested these out for weeks and the actual throughput is nto what they claim. The xbox360 does not buffer much of the video so if there is any radio interferance it will cuase a puase or stutter. The crappy MS wireless adapter they sell for $100 sucks balls. I own one and it will only do standard A,G, and B. There are how ever wireless adapters that will work and use the MIMO routers boost, Linksys makes one and im waiting for netgear to release one. Netgears will be alot better for they have jumped to a 240 mbit connection claim, this really comes to a full 100 mbnit connection in real throughput which should be enough no matter where you place your 360 in your house / apartment. The linksys adapter with speedbooster can still give you stuttering depending on how far and how many obsticles are in your way.
There is some other info Id like to share about .TS viewing on the xbox 360. There is a program called HDTVPUMP you cna use to stream .TS files to your xbox 360 but this is not my method of choice. My spare windows media center pc that I made is to weak to play HD movies but I didnt let that stop me. My media center pc is a "video juke box", I have 30 movies in HD on this machine and all I gotta do is just pick them from a list on my tv and watcvh them play, I dont even have to touch the media center pc for anything. The .TS files are converted to .DVR-MS files which play flawless on the the 360, and is easly converted over in a matter of a few minutes with a tool called TS CONVERTER 1.1 EXE which can be found here
http://www.dvbportal.de/index.html. You will also see hdtv pump which you should also install. Im sure some one will disagree with me but you need 30 mbits of throughput to stream these videos correctly and with out hipcups. Good luck