If you are looking for a awesome online radio station, check out http://x10radio.com/
We usually stream at 128kbps so the quality is superb.
At many times during the day, the DJ will open the request line and you can request whatever song you want. If he has it, he'll play it. I believe he has 2 hard drives of music so it's hard to find something he does not have.
If you would like to be a DJ, login to the irc room at irc.x10hosting.com channel #x10radio or use the chat login form on the website.
Please leave comments on the website if you have any!