If you've ever used TortoiseSVN on Windows, this brings very similar functionality to the Finder. In fact, this was inspired by Tortoise.

Overall, this is an extremely handy utility that enables you to do SVN checkouts, commits, status checks, log checks, etc. on a directory or file right from the Finder. It doesn't have all the functionality of Tortoise, but it has all the essentials, and the rest can be done as needed directly from the command line or via a separate program (I like the free SvnX).

As this is an early release, there are some UI quirks (e.g., no select all/unselect all/invert selection commands in the commit window) and the occasional bug, and its icon badging mechanism doesn't get along very well with Leopard's icon previews, but it's still a utility I don't like to work without as I spend all day, every day working with SVN repositories.