Has anyone heard of/used Slacker radio? It is alot like Pandora radio (check links below) as you can pick a artist/song as base and then rate more music so the station will only play music you like, unlike Pandora, Slacker gives you more freedom over the music Such as stick with only music you suggest or let it choose music like the music you suggest to give you more music choice. You can also direct it to play older music or more current music or a mix of the music age. Also another feature of Slacker that makes it different from Pandora is you can request songs to be played kind of like Music on Demand or you can use one of their pre-programmed stations which you can still tweak. Again like Pandora Slacker has a paid version and a free version. In the end in my little bit messing around with Slacker I would have to say that Slacker sticks it to Pandora by coming out as the better one. Slacker shows to give more bang for your buck in both the free and paid versions.
Check the sites out for yourself.
www.slacker.comwww.pandora.com