The other day some of my colleagues were tweeting about gource, the amazing OpenGL SCM visualization tool. It allows you to visualize git, hg, bazaar (and possible CVS/SVN) logs as animated graphs. Building it on Mac was a bit of a pain, given the amount of crap I had to install for dependencies. However the experience of using the tool once installed is the complete opposite. Go to your source dir, and type 'gource'.
I looked at a half-dozen git reops I work on, and even tried mozilla-central (I gave up after 2 hours of Reading Logs... for Mozilla). Here's a video I made of the processing.js git repo from initial release by John Resig to hand-off to Al MacDonald to the eventual take over by Seneca students. It brings back a lot of memories, and highlights the fact that me being a stubborn hg user refusing to use git and only submitting patches means I don't get any play! I've since learned the error of my ways. <3 git.