Quoted from http://www.maliasoft.com/us/mp3sushi.html

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With only a few clicks, MP3 Sushi allows any Mac to be turned into a network Jukebox or Radio broadcast station. It's a cool way to share and stream music amongst a local network or the Internet. MP3 Sushi is a port of Open Source software - gnump3d, Lame, libmp3lame, iceS and icecast - wrapped with a beautiful user interface.

Although MP3 Sushi was designed to be used by everyone, it still provides advanced features such as live downsampling, access protection and network configuration.

Thanks to the Rendezvous technology (aka ZeroConf), an extra application called MP3 Buddies makes it easy to find every Jukebox and Radio servers on your local network. Once MP3 Buddies is launched on a user computer, a list of servers is displayed and in just one click the user can browse the Jukebox songs in his or her favorite browser or listen to the Radio in iTunes.

Features and requirements

• Mac OS X only - MP3 Sushi makes great use of Mac OS X Unix foundations and cool new features such as: Rendezvous, Toolbars, Sheets, Extra Menu, Dock Menu, User Defaults... It's written entirely in Cocoa using Objective-C.
• Easy to install - There is nothing to install - it works "out of the box"...drag and drop MP3 Sushi folder then click on the Start buttons if you don't believe me!
• Easy to setup - The preferences have been optimized to let you have a powerful Radio and Jukebox server running in just a few clicks! MP3 Sushi handles every config files for you!
• Uses Rendezvous - So you don't need to communicate the server URLs to the listeners on your local network.
• Open-source - Uses reliable open-source software such as gnump3d & Lame (Jukebox), icecast & ices (Radio). Also, the source code of MP3 Sushi is freely available.
• Auto-launch at boot - If you have Administrator privileges, you can launch MP3 Sushi at boot time, without the need of a user session. MP3 Sushi uses daemons in the background.
• Security - You can set up who can or can't access the Radio and Jukebox. You can even setup a password to restrict access to your Jukebox.
• Downstreaming - you can choose the bitrate of the files you stream, both for the Radio and Jukebox.
• Localizations - MP3 Sushi is available in English, French, Italian, Japanese and Spanish.

What MP3 clients are supported?

With MP3 Sushi you can broadcast your own Radio station to many different hosts across the Internet. So far, MP3 Sushi has been tested with:
• Apple iTunes
• Real Audio G2 (on Windows)
• Microsoft Windows Media Player
• mpg123 (on Mac OS X, Linux and FreeBSD)