My day-job means that I now have a github account.
And I have to say, I am very impressed by it.
I decided on bzr last year as my distributed source-control system, mainly because it felt so similar to svn and it was written in python. In comparison, git is still bloody confusing. But bzr seems to be losing momentum (hg is the pythonic candidate in the race) and git-hub with its YASN-oriented social approach to source-hosting feels way ahead of other repo-hosting services like Launchpad and Google Code or running my own Trac-SVN solution.
So, I'm quite likely to switch my projects over to github in the near future.
PS : Oh, and if felt really cool to just fork my own repo of Folknology's Reactored. Encourages me to start playing with it.