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 when coding or working on something requiring my full attention. I listen to Lil Wheezy radio when 5:30 rolls around and it's time for COD.
They also don't charge at all for the service. Until today. This morning. The linux client asked me if I've enjoyed the service:
So I subscribed. 3 USD/month for access to their radio services. I went for a year. Feels good to support good software. Maybe I'll try to whip up a way to stream radio on the BUG.