Live streaming help

I've been asked to DJ a live set for another forum I use via their online radio station.

It's normally streamed via Winamp and a Shoutcast plugin. I'm having a bit of trouble getting around this as its Windows software.

Is this possible as a Mac user? Any help appreciated as I've never done anything like this before. Cheers.

I am surprised you did not find this:

Rogue Amoeba | Nicecast: Broadcast Any Audio To The Internet, Right From Mac OS X