Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
I am having the same problem with my xbox 360. It worked great for about a week and now it is only letting me stream at the lowest level. I have Road Runner as well. I called Netflix and they said it seems to only happen to Cable customers, but I'm betting that once they moved to the Xbox they now have too much traffic and need a major upgrade on their servers for all of the new volume.