Cloning this repository:

git clone git://gitorious.org/0xdroid/packages_apps_demo-apks.git packages_apps_demo-apks
cd packages_apps_demo-apks

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

git remote add packages_apps_demo-apks git://gitorious.org/0xdroid/packages_apps_demo-apks.git
git fetch packages_apps_demo-apks
git checkout -b my-local-tracking-branch packages_apps_demo-apks/master_or_other_branch