I've been wanting to learn more about d3 for a while now. I love /r/dataisbeautiful but wasn't sure where to begin. I also think it's interesting to look at how much data there is about your own life. So I started by downloading my clipper card ride data. Unfortunately they only seem to offer it as a pdf, so I manually scraped 90 days worth of info off of it and made a little graph about my commute using public transportation in the Bay area lately.
Then I learned that the code review tool we use at Twitter, gerrit has an API by which I could acquire data about the code reviews I'd submitted. So I made another chart about that.