gnome-git

With a couple of lines in your ~/.gitconfig file, 
you will be able to check out Gnome projects like this:

git clone gnome:nautilus


If you want to check out git repos anonymously, 
these are the ones to add:

[url "git://git.gnome.org/"]
  insteadof = gnome:


If you have a user account on git.gnome.org, 
add this (substituting USERNAME as your actual username):

[url "ssh://[email protected]/git/"]
  insteadof = gnome: