Cloning this repository:

git clone git://gitorious.org/posterous-py/posterous-py.git posterous-py
cd posterous-py

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

git remote add posterous-py git://gitorious.org/posterous-py/posterous-py.git
git fetch posterous-py
git checkout -b my-local-tracking-branch posterous-py/master_or_other_branch