I created an account with slacker radio (internet based) a few months ago and absolutely adore it...wanted to spread the musical love and share this with you guys...
I was using pandora for years before that... until one of my buddies recently told me about slacker. You guys gotta check this out
They charge you $45 for the whole year...you can get unlimited skipping between songs, create your own stations, no advertisements, etc. But they also have pre-made stations that are created by their DJ's...variety seems a little better than Pandora in my humble opinion. The way that you can customize your personal stations is also endless.
In addition, you can actually cache the radio stations to your mobile phone...I have fallen in love with this thing. If you're in an area with a bad connection (under ground on the train like myself for example), or out in the boonies...it's ideal because you can save the full station to your phone and you don't even need the connection! Sound quality doesn't suffer either, I was shocked!
Was a pandora follower for years... but slacker takes the cake in my opinion..definitely check it out gang. 
