Cloning this repository:

git clone git://gitorious.org/gnome-project-mallard-online/mallardo.git mallardo
cd mallardo

Add this repository as a remote to an existing local repository:

git remote add mallardo git://gitorious.org/gnome-project-mallard-online/mallardo.git
git fetch mallardo
git checkout -b my-local-tracking-branch mallardo/master_or_other_branch