How to Use Your Mac as a Server:
Turn your Mac Mini into a server! Yes, that's right, with a little know-how and a little spunk, you can turn an inexpensive Mac Mini computer into a server to provide services over you network. You won't even need the Mac OS X Server, just the Mac OS X Client, so there is no extra software to buy, just the Mac Mini and it's operating system.
This video tutorial from FreeMacBlog and MacMiniColo will show you how to host multiple websites on your Mac Mini server. It will be about multiple web sites (domains) on a single Mac. In Apache parlance this is called setting up "virtual hosts". Just as FreeMacBlog.com, FreeMacWare.com, FreeMacUnix.com, etc. all run on a single Mac at Macminicolo.net, with these instructions you can do the same.