Unfortunatly Internet Radio will soon be going the way of the Dodo as the FCC among other governing bodies have recently decided to levy a 70 cent fee on every song that a station broadcasts over the internet. This is way out of proportion with what they charge normal radio stations and it really sucks. You can find more info here
http://www.saveinternetradio.org/
Anyway... Try here:
www.radio-locator.com
I personally find mp3.com to be too commercialized
Oh... and if you like country, the local public radio station does a country show every saturday morning. Or used to. I don't know anymore cuz I stay up way too late on friday nights playing NWN
the link is
http://kgnu.org/
DeSoya