I’ve recently been using NautilusSVN, which is described on the project homepage as:
NautilusSvn is a Python extension for Nautilus which integrates a load of Subversion functionality into the GNOME Nautilus file manager, basically as a clone of the TortoiseSVN project on Windows.
Here’s a screenshot:
It’s only up to version 0.12, but it’s already very easy to download and install, featured packed, and I haven’t experienced any issues.
Conclusion: Highly Recommended.