I've been a member of last.fm for a while now, since before they offered a music-streaming service (I think), back when they were audioscrobbler. They still offer scrobbling services, which track your listening habits and allow you to go social on it. I've even got the Scrobbl iphone app.Anyway, I primarily use last.fm for their (IMHO) better-than-pandora stations. They don't do commercials, they don't have a rate-limit for fast forwarding. I listen to Rachmaninoff radio...