Don't forget to install all the vim bundle submodules:
git submodule update --init
Then link up as many files as you want to use...
cd ~ ln -sf config_files/vimrc ~/.vimrc ln -sf config_files/vim ~/.vim ln -sf config_files/irssi ~/.irssi ln -sf config_files/gvimrc ~/.gvimrc ln -sf config_files/ackrc ~/.ackrc