14 unique channels of listener-supported, commercial-free, underground/alternative radio broadcasting from San Francisco.
SomaFM is entirely listener supported. They have an interesting support model where they show their monthly broadcasting expenses on their main page, and how much money they have left to raise for the month to cover those expenses. And they send you nifty goodies if you donate!
Also, @somafm on Twitter.
A list of the channels:
BeatSlacker 