Paste this into your shell:
curl https://raw.github.com/bentruyman/TextMate-Bundles/master/install.sh | sh
Or do it the hard way. First, clone this repository into your user's TextMate application support directory. Then init/update the repositories submodules.
cd ~/Library/Application\ Support/
mv Textmate TextMate-Backup
git clone git://github.com/bentruyman/TextMate-Bundles.git TextMate
cd TextMate
git submodule update --init
That's it!
Note, this will move any customizations you may have made into a
TextMate-Backup directory.