Musicovery Discovery
Ooo! This is one that you just have to try out! Musicovery lets you run a radio by selecting the genres of music you like and then choosing from a continuum of Energetic, Positive, Dark and Calm. Then you get a morphing cloud of choices. Click on one you would like to hear and it immediately becomes the center of the cloud and you see more related songs. And best of all, you get to hear the songs you want. Not suggestions of things like the songs, but the actual songs. This rocks! Literally.