Somewhere along the way in switching from Fink to MacPorts (ostensibly because MacPorts is better supported) I shutdown my local SVN server. Strangely, the SVN for MacPorts doesn't include anything to assist in running a local SVN server.
Fortunately I found this useful snippet and it seems to work great, even after a reboot. Be careful to change the user name (at the bottom), the group name (at the top) and the SVN root repository (towards the top). For my system, I created a www user and www group as the owner of the SVN repository.
It may seem odd to run SVN server on a laptop; but this laptop is my development machine, and it goes with me everywhere, so I'm never in a position where I can't access my repository. Dave Thomas encourages you to store everything in version control, and I do my best.
Over the weekend, I'll be upgrading to Leopard, hopefully this will continue to work. I'm optimistic.