I recently read this article about Lord of the Files: How GitHub Tamed Free Software (And More). There's some interesting trivia about how GitHub was formed and has developed, particularly regarding the use of socialising and social coding to differentiate it from existing repositories like Sourceforge. I particularly liked this comment about the possible wider and future impacts of GitHub:
A tool like GitHub could also make it easier for constituents to track and even voice their opinions on changes to complex legal code. "When you really think about it, a bill is a branch of the law," [Ryan Blair] says. "I’m just in love with the idea of a constituent being able to send their state senator a pull request."
It's interesting that GitHub is moving closer to crowd sourcing - where volunteers fix other users' code, just because they can. It may or may not benefit the volunteer personally, but the collective improvement of easily-accessible code should improve things for everyone.