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.

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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.

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[magit-annex](https://github.com/kyleam/magit-annex) adds magit support
for a few features, including adding files and syncing.