[Andrew]

So you have your server set up to share a filesystem (AFP or NFS?) that you mount on both the desktop and laptop? Then you can use the "Disk" sync option for this. This would not only let you do the syncing without having to set up WebDAV, but would also mean that you could use OmniFocus on your laptop even when you don't have access to the server.

Edit: Right, Curt beat me to it.