From the Shoucast help documentation ;)
"How do I make a link off a webpage for people to listen to my server?
Answer: SHOUTcast 1.1 and above supports a direct link off the SHOUTcast
server to reference itself via the URL:
http://your.server.ip.here:yourport/listen.pls.
For example, if your server's IP address was 192.168.1.10 and running on port 8000
you would use http://192.168.1.10:8000/listen.pls, or as a web link:
Listen to my server (click <A HREF="http://192.168.1.10:8000/listen.pls"%gt;here</a>)