Nayan Hajratwala over at Agile Shrugged managed to write a really great article describing how he got Subversion repos running on Mac OS X Server.

I got mine working on Mac OS X 10.5.8 but had to make a few different changes in order to get things working. His doesn't deal with multiple SVN repositories, only with a single one. This isn't ideal and I highly doubt anyone would go to the trouble of installing a SVN server (Click here for the full article...)