I actually took the time to look into the Firefox bookmarks for the current backtrack 3 security analisys distro and immediately got hooked to SOMA.FM
14 unique channels of listener-supported, commercial-free, underground/alternative radio broadcasting from San Francisco.
Very nice tunes indeed, my favorites are:
Drone Zone Served best chilled, safe with most medications. Atmospheric textures with minimal beats.
Space Station Soma Tune in, turn on, space out. Spaced-out ambient and mid-tempo electronica
Tag`s Trip Progressive house / trance. Tip top tunes.
I recommend you check out alle the channels listed directly on the main page!