My Vim configuration is maintained along the lines described by vimcasts.org http://vimcasts.org/episodes/synchronizing-plugins-with-git-submodules-and-pathogen/

Installation

git clone https://github.com/dhinus/vimfiles.git ~/.vim

Create symlinks:

cd ~
ln -s .vim/vimrc .vimrc

Switch to the ~/.vim directory, and fetch submodules:

cd ~/.vim
git submodule update --init --recursive

Updating plugins

To update a single plugin:

git submodule update --remote --recursive bundle/$MODULE_NAME

To update all plugins:

git submodule update --remote --recursive