Cloning this repository:

git clone git://gitorious.org/+mer/maemo-af/hildon-thumbnail-mer.git hildon-thumbnail-mer
cd hildon-thumbnail-mer

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

git remote add hildon-thumbnail-mer git://gitorious.org/+mer/maemo-af/hildon-thumbnail-mer.git
git fetch hildon-thumbnail-mer
git checkout -b my-local-tracking-branch hildon-thumbnail-mer/master_or_other_branch