Shoutcast.com Call it MP3 Radio. Shoutcast servers broadcast MP3 music as streaming audio on the Net; you'll need the WinAmp audio player on your PC to listen in "live." A way to enjoy MP3 music without downloading it.
Mp3spy.com offers a free program that helps direct you to Shoutcast stations, and it tells you what's on. Once you start listening to a particular broadcast, mp3spy will identify each song, tell you how many other people are listening and rate the quality of the transmission.
Spinner.com Scores of streaming audio channels grouped by genre. Recent additions: Brit Pop, Hair Metal, Salsa.
Broadcast.com Streaming audio portal makes local radio stations global.