Oh? The Compendium used to be hosted off an old PC running Linux and Apache + MySQL and connected via cable service back in the day. Now we just use cheap shared hosting, since most of the development and experimentation on the site has stopped, so we don't need as much freedom with our hosting options (and I don't have any time).
Future development will probably be done with CherryPy, Django, or even UCW, probably running behind Lighttpd, so we might switch to a custom server placed in colocation (depending on what other projects I have at the time). It'll be a while before I'm free to work on anything like that though.
Hmm... I think four years ago I was cutting my teeth helping some friends admin their dedicated server, which they were using to resell shared hosting to several people. I can't believe it's already been that long. In fact, this site's getting kind of old...