What is Shoutcast?
The most common use of SHOUTcast is for creating or listening to Internet audio broadcasts. SHOUTcast makes it possible to inexpensively set up an Internet broadcasting station, so hobbyists and large radio network owners alike can use it to set up their own broadcasting network for a fraction of the cost of a traditional AM broadcasting or FM radio station.
Some traditional radio stations use SHOUTcast to extend their presence onto the web.
More info and radio selection on http://www.shoutcast.com