git-annex repositories are often kept private, but here's a list of some of the public repositories that you can clone to try out git-annex.
git clone https://downloads.kitenet.net/.git/
Various downloads of things produced by Joey Hess, including git-annex builds and videos.
debconf-share (currently unavailable via IPv4)
git clone http://annex.debconf.org/debconf-share/.git/
DebConf Media, photos, videos, etc.
git clone https://github.com/RichiH/conference_proceedings.git
A growing collection of videos of technology conferences. Submit a pull request to add your own!
MRI brain scan data
git clone http://psydata.ovgu.de/forrest_gump/.git studyforrest
High-resolution, ultra-highfield fMRI dataset on auditory perception.
GStreamer integration testsuite media assets management
git clone https://github.com/ntnn/ccc-media-annex
git-annex repository using the CDN of the German CCC.
Contains a lot of talks (mostly in German) held on events from the CCC as well as other stuff.
A slightly outdated mirror of http://ifarchive.org. Scripts should probably be written to update the archive regularly.
This is a wiki -- add your own public repository to the list! See centralized git repository tutorial.