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.

• downloads.kitenet.net
  git clone https://downloads.kitenet.net/.git/
  Various downloads of things produced by Joey Hess, including git-annex builds and videos.

• debconf-share
  git clone http://annex.debconf.org/debconf-share/.git/
  DebConf Media, photos, videos, etc.

• conference-proceedings
  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!

• ocharles's papers
  Lots of CS papers read by Oliver.

• MRI brain scan data
  git clone http://psydata.ovgu.de/forrest_gump/.git studyforrest
  High-resolution, ultra-highfield fMRI dataset on auditory perception.

This is a wiki -- add your own public repository to the list! See centralized git repository tutorial.