I got an add in x-fire about an ingame radio player, checked it out and it's pretty decent, it has 6 channels to choose from and the interface is fairly easy to use
TRACTION Worldwide In-Game Radio Network - Powered by STICKMAN Entertainment, Inc.
I'm not posting this for rep, as i didn't come up with it, but rather to share with the nice people at MMOwned ^^
not sure if this sstuff is for this area of the forum, if not can a mod move it please
*Please Note* this is still in BETA testing so may be buggy and probably have more channels added on soon