... be sure to check NautilusSvn. I usually prefer the command-line SVN, but I got curious about this one( meld integration, svn rev and user as columns, ...).
So what do you need to try this on Gentoo?

  • Python bindings for SVN: dev-python/pysvn, bug #62852, grab it in my overlay
  • Python bindings for Nautilus: gnome-extra/nautilus-python, bug #78021. A new version was released a few weeks ago, again grab the ebuild from my overlay
  • dev-python/wxpython and dev-util/meld from portage (runtime dependencies)

Then head to NautilusSvn web page and follow the README. Remember to restart Nautilus, and there you are! People motivated in writing an ebuild can visit bug #147433

ps: if you prefer konqueror, kdesvn should do the job too