I am using the DVBWorld software.
Just tried one of the HD 422 feeds posted in the WUT area and DVBWorld.exe (the app I'm using) was maxing out the machine at 99%. Video very slow and breaking up, but audio very good. I just tried MyTheater and it would try locking on the feed, but not scan it in.
This is sort of a lower end testing box that I threw together at the last minute. Have a 3.06GHz CeleronD running with 1 gig RAM. GeForce6200 (256MB PNY variety). Windows Media Center 2005. Not running the DVBWorld.exe inside of MCE of course, just by itself. Nothing else running (other than the system apps). Fresh install a few days ago.
Installed the nVidia PureVideo codec, but don't have any idea how to tell this program to utilize it. I'm not a Windows guy.