You forgot the best of all: svnX ( http://www.apple.com/downloads/macosx/development_tools/svnx.html ).

It's not an integrated solution, but it gives you the best access to a lot of the svn command line options.

Also, I tend to use the SVN bundle in TextMate for quick updates / diffs.

What Griffin said.

I should add that we primarily use a custom TextMate bundle that I put together that also posts the commits to our Campfire chat. Otherwise we use the shell. I rarely have to use SVNx -- especially since it's actually faster to browser the repo in Unfuddle.

Right now we're seriously evaluating using Git as it seems to be sweeping the Rails community and everyone is gaga over it. And it does seem to provide some great functionality that SVN lacks. I just got my GitHub invite -- I can pass one along when I get some of my own invites.

Oh, and I've heard that SCPlugin isn't great; maybe it's been updated. Not sure it works with Leopard...