If this is a joke, it's a damn good one. Otherwise, it's a cool feature :-)
However it's pretty annoying that there's no access control through svn. I just checked out my private repo without entering any credentials :(
(For example, defunkt/github)
That said, schacon has been working on increasing compatibility between VCSes like producing hg-git. It'd be great if a site like Github that was significantly more agnostic about VCS.