Yay!
I've volunteered to do a quick intro-to-our-scary-git-future session at the New Orleans hackathon; I'll see if I can lay out a nice workflow demonstration from a few different perspectives:
* staff or very active volunteer developer who's doing a lot of core or high-priority extension work all the time * reviewers monitoring incoming stuff * extension maintainers working on their own and sharing their code * ad-hoc patch submissions * larger feature/refactoring submissions * batch updates such as localization maintainers * deployment branch management * using the VCS as a deployment source * how things can interact with Bugzilla etc
-- brion