Running a Web Server on Mac OS X: Apache Made Simple
An anonymous reader writes "Having recently moved over to Mac OS X, I decided to look into running my own Web and FTP servers again from home. To my surprise, I discovered what many already know... that bundled into the underpinnings of Jaguar's networking framework was a distribution of Apache that appears as simple or robust as I want it to be."
See here for more details, #10 in the linked article. Otherwise, your mac will go beep beep beep and devour your webpages. It's like.....a total bummer and stuff.