If you’re using Subversion (most developers probably are these days) and you’re on Windows, you probably use TortoiseSVN. It’s arguably the best SVN client for Windows. And now it’s even better, with this snappy Firefox plugin you get the TSVN menus in the web frontend of your SVN repository. I tend to use Firefox for surfing around repositories and then switch to the TSVN repository browser to do any work, now I don’t need to. A great time saver.