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!"
No it won't hurt HD DVD clearly but Porn hasn't the same influence that it did during the Beta/VHS wars as the only way to get porn then was magazines and sleazy movie theatres. Now you have the internet, DVD rental, mail order rental, Cable TV etc. Not the same factor. Nowadays you don't have to look for porn...it comes looking for you.