www.live365.com has some interesting stuff (I like the old time radio shows/x-1/dragnet/etc.)...
However, it is a bit difficult to get to work if you have the spyware/spybot/popup-stopper stuff installed and high IE security... The free version (don't know about the pay version) wants to run the player in an IE window so that they can feed ads. If you get it working, seems reliable.
You have to give your email address to register--but I have never received one mailing (other than the registration mail) after I gave them my address (6-12 months ago).
I do like shoutcast--free of ads and pretty free of player weirdnesses.
-Bill