Here's a waste of time I could just not resist: MIT's Project SIMILE has released a rather nice Timeline Web Widget. Combine that with GitPython and a bit of glue code in Python, and you get a neat, one-page summary of the software work I've done as part of working towards my PhD. Here's a screenshot if you're too lazy to click through:
Note that (nearly) every commit is hyperlinked to the git web frontend, where you can view what was actually changed--just click the title text in the popup bubble.
If you'd like to do this yourself, the code is available, you can get it with
git clone http://git.tiker.net/trees/commit-timeline.git