First, git it!

git clone git://github.com/choang/vim-config.git ~/.vim

Once cloned, you need to update submodules

cd ~/.vim
git submodule init
git submodule update

Create a symlink for your vimrc

ln -s ~/.vim/vimrc ~/.vimrc

cd ~/vim
git submodule add <git-repo> bundle/<plugin>

For example

git submodule add git://github.com/tpope/vim-endwise.git bundle/endwise