ShowStream is a service for music groups, allowing you to stream your shows LIVE over the internet. Stream 5 shows a month for a low price. 30, 200 and 800 listener options available. When you create a ShowStream account you get a small piece of HTML you can add to your web pages, since the service is hosted for you there is nothing to install on your server!
The audio stream plays in listeners' browsers, and a chat room is included so that listeners can chat with each other. A tiny Flash movie plays the stream, or if Flash isn't available a small Java applet is used. Either way there is nothing for the listener to download and no security warnings or pop-ups. If they don't have Flash or Java, links are displayed to play the stream in an external player (Windows Media Player, Apple's iTunes, WinAmp, etc).
If you're in a band and have MP3s of your music available, the next step is broadcasting your shows online!