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!"
After I saw it disected, I could tell they were selling it for a loss. It's basically a computer, a very dedicated computer. It has a PC HD-DVD drive (that alone caused me to think that $499 is way low), then add P4 CPU, DDR memory, etc. etc. If this were an XBOX, it would get hacked. How cool would it be to stream HD over the USB port to another PC, or install an internal hard drive?
I hear it behaves itself quite nicely after the firmware update. Still loads media slow (because it is a PC after all), but after that seems to work well.