I just created a Google Code project for a quick and dirty little app I built, SvnMergeGui. As you may suspect, it’s a GUI to SvnMerge.

It uses ClickOnce for the installation (because it was really easy to do from VisualStudio), and is pointed at the svn repository for updates – so although I’ve never tried it, the theory is that it will have automatic updates built-in. You can download the install files from the project page linked above.