I made http://tutorials.github.com. It's a variant of a larger project I'm working on to make documentation more personalized and more awesome. I hacked it together during the Emerging Technologies in the Enterprise conference in Philadelphia, and I posted it to HN, but it never made it to the homepage.

I definitely should have polished it up more and included documentation on how to use it and why it's cool and why building it on Github's infrastructure was a particularly neat trick, but I announced it too early because I was excited.

I definitely underestimated the importance of proper marketing and UI, even for an MVP for the high-tech crowd.

Edit: typo and clickable link