Rocket Broadcaster - Broadcast live to your internet radio station (Icecast, SHOUTcast, and more).
LadioCast - Free application that will allow you to broadcast music for IceCast with easy mixing.
SHOUTcast Radio - SHOUTcast Radio is the home of free Internet Radio.
Wohooo.net - Create Your Own Online Radio Station
Live365 - 5,000+ online radio stations run by real people, not generated by computers.
Icecast - icecast is free server software for streaming multimedia.