I followed the instructions on the Wiki and have fooled around since then and I still can't get it working.
Using the control panel, I enable a directory as
http://www.mydomain.net/ (directory goes here)
Throw in a user account, hit "change these settings"... and nothing.
I can't connect from OS X using clover-K to connect to a server ("You cannot connect to this server because it cannot be found on the network...") or WinXP (standard XP lame error messages go here).
toggling password protect on and off
toggling WebDAV on and off
trying to enable webdav on a different directory
taking a break and having a beer
repeating steps 1-3
I don't know what else to do at this point - is there something amazingly obvious I'm missing?