Cornerstone has been out a few years and version 2 was just released. It is now by far the best value, fastest and feature rich Subversion client for the Mac. The merge features and annotations alone are awesome. I have never seen such a cool take on either of them and the way you can just click a block of text when comparing and have the log message displayed for that block together with all the statistical information you'll ever need in a stunning UI, it's just awesome.
Seriously I can't recommend this tool enough. It is in a different league to Versions.
