For my personal enlightenment: Apache Web Serving With Mac OS X. I worked through the first section last night at work with my iBook, and was delighted to have the simple little page show up on my Sun workstation (via the skinny ethernet cable attached to my laptop). More whenever I have the time, courtesy of this everlasting link!
Kind of amusing, as I've become the go-to guy at work for SSH, and I just today spent a chunk of time getting an IRC server running on my machine, then testing it with a chat client written in Emacs Lisp, ZenIRC. The idea is to allow collaborative communication while working with shared desktops (all inside the firewall, so don't get all excited, industrial spies!).