bergey has developed an emacs mode for browsing git-annex repositories, dired style.
https://gitorious.org/emacs-contrib/annex-mode
Locally available files are colored differently, and pressing g runs
git annex get on the file at point.
John Wiegley has developed a brand new git-annex interaction mode for Emacs, which aims to integrate with the standard facilities (C-x C-q, M-x dired, etc) rather than invent its own interface.
https://github.com/jwiegley/git-annex-el
He has also added support to org-attach; if
org-attach-git-annex-cutoff is non-nil and smaller than the size
of the file you're attaching then org-attach will git annex add the
file; otherwise it will git add it.
magit-annex adds git annex operations to Magit.