git clone git://github.com/lamereb/dotvim.git ~/.vim
ln -s ~/.vim/vimrc ~/.vimrc
cd ~/.vim && git submodule update --init
cd ~/.vim && git submodule add path/to/plugname.git bundle/plugname
git add .
git commit -m "Added plugname bundle as submodule."
Also, add the following line:
ignore = dirty
to the corresponding bundles .gitmodules
entry
See here for more info.