I’m really excited about Turntable.fm, a social DJ network where you can play songs with your friends (or strangers) in virtual “rooms”. It’s a simple concept but it’ll surprise you how much fun you can have on it. It’s currently invite only, but if you have any Facebook friends already using it then you can use it as well.
I’d suggest checking it out if you haven’t already, its tons of fun. Check out the screenshot below for an idea about how the interface works.