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'm also taking the wait and see route... will one format prevail? Prices must surely come down for both hardware and movies before I make the jump. My current 480p flicks look and sound great to me! Not to mention my HD tuner and my primary TiVo both contain DVD players... I have litte desire to mothball them or add additional boxes.