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 agree with DanMacMan, and in addition to his comments, this would be incredible for "helmet-cam" applications. I've seen to many HD broadcasts where an HD camera simply cannot be used for certain shots. The dimunitive size would really open up some possibilities. As an owner of an HD digital camcorder, it would e great to be able to keep it in my backpack with this tiny camera mounted to my helmet while boarding, skiing or mountain biking.