Epic Rock Radio

I've been hooked on this since reading about it here. It's a great mix of music. Close enough to my own library, but with some great stuff thrown in that I don't have. Great station.
 
ERR is a great station

Other good ones are PRM http://www.progrockandmetal.net/ and Dark Horizons on Live365.com

I miss being able to stream music at work :(

You might want to try to get around the firewall by setting VLC as your default media player...and then choosing the last player option on the page. You can then close your browser and let it run.

I try to stay away from live365...seems to have a lot of adware associated with it. Ok, ANY is too much for me. At least Epic does not "go there."