ok the shoutcast "tutorial" is kinda vague, so i'll try to walk ya through it... download:
this,
this, and
this.
install them all, and reboot
go to the folder where you installed shoutcast, and make a shortcut to sc_serv.exe so you can find it whenever you wanna run it. open the file, and go to the edit config option, and pay attention to the stuff it says, main thing to do is change the password that should default to "changeme"
ok, while the server is running, open up winamp and go into the plugins, and find the DSP/effect one, and select the shoutcast one. set the server to be whatever your IP is, along with the port (usually people pick 8000) along w/ the password you changed in the server edit config. set the format to whatever you want, then hit connect. if done properly, it should connect to your server, and for people to listen, they just gotta open up winamp and hit CTRL+L then type in your IP:8000 (if 8000 is the port you selected)
EDIT: damn smilies