[snogglethorpe]

> The ideal case would be complete interoperability, where you could use git locally, yet collaborate on a daily basis with people using the project's non-git VCS

My impression is that this is the goal of the git "svn remote" work which has been slowly worked on for a quite a while, mostly by Google-Summer-of-Code participants.

With svn-remote support, subversion repos would be handled as a special types of remote at push/pull time, instead of requiring the user to use special commands and a different workflow. This same discipline would work for other repo types as well, and I think much of the infrastructure work being done now will be useful for implementing remote handlers for them.