I always seem to be on a 30 secondly delay so this can very easily be a repost.
I was just told by a co-worker of mine about
www.pandora.com. If you havent checked it out yet do it! Its a free music player that lets you make 100 commercial free stations at one time. You pick a band and that station plays other bands with the same harmonic signature. So say you have a thing for Korn, it will play korn, static x, Rob Zombie, rage against the machine, etc. Its pretty badass actually.
Just thought I would share