It looks like DVC has a great potential for managing several kinds of branches within Emacs. I've used it in the past when it was named Xtla and I was hacking on Muse and Planner which are managed by Arch.

Now I would love to have this great interface play nicely with my Bzr (mostly) and Darcs (marginally). Basic support is provided, but still I miss the browsing and partner facilities, and also the cherry-picking interface.

I've checked out all this, will have a couple of days to study the code, and I hope I'll be able to contribute after that.