Live365
A internet radio station composed of member-created stations in every genre of music known to man, in which regular music fans make and maintain the stations, pick the music, and run the show. In a world in which clear channel owns the airwaves and punk pop, emo, and corporate created "singers" like Ashley Simpson dominate, it is one of the primer sources for people who are actually fans of music as opposed to fans of pop culture, and who also like discovering new bands and new kinds of music, or at least bands and music that are new to them.
I discovered a really talented band the other day on live365.