What GUI Administration / Management tools are there for an SVN repository on Windows?
There's also my own program called PainlessSVN. It only works with repositories setup to be served with svnserve.exe It can work with Subversion servers in your LAN. I'm currently working on version 1.1, which is almost a complete rewrite. Check the blog to see what the new stuff is.
If you want to work with an existing Subversion server, then my program will work for you. If you want to start from scratch, then VisualSVN Server is pretty good.