Subversion is really gaining track. It's not a rocket science to conclude that, but is a lot of happening in world of SVN tools.
I already gave thumbs up for VisualSVN. Those guys now created VisualSVN Server which is basically a package of Subversion installation wit Apache and a visual management console.
- it's free,
- it's small, just 6 MB download,
- installation is super simple.
- can't rename users,
- it would be nice to just get the admin tool for those of us who already have server up and running.
SVN administrators can now choose between PainlessSVN and VisualSVN Server when looking for a management console, although I don't believe there is a true need for that, but that's a whole another story.
Subversion also comes in several "distributions" and you can choose between original, CollabNet Subversion and now VisualSVN Server.