It's _easy_ to install a Subversion Server on Leopard
Sonzea.com: Installing a Secure Subversion Server on Leopard
These instructions are complete, easy to understand, they WORKED the first time, what a great find.
What's really nice is how little you have to install yourself to get this working. Leopard (client) comes with Apache 2 and Subversion 1.4.4 so all there is to it is a little bit of simple configuration. Getting TRAC set up as well is just a bonus.