Cloning this repository:

git clone git://gitorious.org/~arialia/tiled/arialias-tiled-qt-isostaggered.git arialias-tiled-qt-isostaggered
cd arialias-tiled-qt-isostaggered

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

git remote add arialias-tiled-qt-isostaggered git://gitorious.org/~arialia/tiled/arialias-tiled-qt-isostaggered.git
git fetch arialias-tiled-qt-isostaggered
git checkout -b my-local-tracking-branch arialias-tiled-qt-isostaggered/master_or_other_branch