Here's the simplest way there is to set up streaming audio, either from a server, or from your home computer (true - if you've got the bandwidth).
Download Jetaudio here.....
It comes with a neat little addon called Jetcast that makes it a breeze to set up a streaming source in mp3 or wma format.
An afternoon with some sample audio files, and you can be up and running. It's good fun to play with too.
I hope this is some use, as the only reason I'm here posting this is because I clicked the wrong link in my bookmarks. Serendipity dog!