I find it somewhat odd that, given git's emphasis on distributed version control, we see so many git users have centralized themselves quite heavily on GitHub.<p>Whenever GitHub runs into problems like this, it reminds me of when a team's CVS or Subversion servers used to go down. It could be a pretty disruptive occurrence, if it wasn't resolved quickly. While git can theoretically handle this better, in practice the use of GitHub, for instance, renders git just as susceptible.