Free options here using Pirate Radio and some other:-
http://radio.about.com/library/weekly/aa013003c.htm
http://radio.about.com/cs/pirateradi...irateradio.htm
You can also do the broadcasting using ShoutCast but configuring it is troublesome.PirateRadio is an easy one.
Checkout ShoutCast here:-
http://www.shoutcast.com/download/broadcast.phtml
Some commercial options:-
http://www.jesterradio.com/ownstation.htm