At 10th Magnitude, we have used Beanstalk as our central code repository. We transitioned to Mercurial about a year ago, which Beanstalk supported.
Today they sent around an email saying they're ceasing Mercurial support—including existing repositories—on September 30th, and would we care to switch to Git?
No. No, no, no. No Git. I'm not asking people to learn another damn version control system. (Plus Git doesn't quite suit us.)
But fortuitously, this forced re-evaluation of Beanstalk coincides with a general self-reflective re-evaluation we have underway. That doesn't mean we're going to Git, or (angels and ministers of grace, defend us!) back to Subversion, but as long as we have to move off Beanstalk, why not take a look at our issue tracking, external bug reporting, project management, and document sharing?
I'll have more about this as we get closer to the September 30th date, along with some awesome stuff about how we have developed an Azure application that does single sign-on with...just about any identity provider.