Sadly, googlecode is shutting down and we needed to find a new home for Crack.
I've been a long time fan of Mercurial (I think I was using it before git existed) but I seem to be in the minority in that. Most Crack contributors appear to prefer git. There's also a huge community that's developed around github. So, given that our current project hosting is going away, this seemed to be a good time to convert entirely to git and relocate to github.
In truth, I've been running the project out of git for over two months now. I migrate changes to the mercurial repo on googlecode whenever I push, and I expect I will continue to do so for the foreseeable future, but the repository in github (crack-lang/crack) should now be regarded as canonical. Patches to the codebase should be sent as pull requests or as git patches generated by "format-patch". We will no longer accept requests to pull from a mercurial repository.
Hopefully we'll get around to replacing our home page before googlecode disappears entirely.