It's Magit! A Emacs mode for Git.
the source:
git clone
git://gitorious.org/magit/mainline.git
git clone
http://git.gitorious.org/magit/mainline.git
a tarball:
magit-0.7.tar.gz
the docs:
User Manual
the cheats:
Cheat Sheet
(by Daemian Mack)
the jive:
Mailing List