Simple commit mechanism for non-technical users

[D Sundstrom <sunds@peapod.net>]

I use git to manage all project artifacts, including documentation,
proposals, presentations, and so on.

However, I have a hard time convincing non-technical staff to learn
enough about git or to take the time to go through the effort of
committing changes to a repository.  So the steady stream of email
attachments with "Acme Specification v3" or "final final spemco
proprosal" continues.

I'd hoped there was a simple web interface that would allow a user to
upload and commit a file to a repository, but I've had no luck finding
one.  (I've used cgit for browsing, but it is read-only).

Is anyone aware of a simple way I can have my non-technical users
manage their documents against a git repository?  Ideally this would
involve no installation of software on their machine (unless it were
compelling, for example, the Finder plugin for SVN on the mac was a
great tool for these users; or at least those on a mac...)

-David