TextMate user's shouldn't have anything that the Vimmers and Emacs users don't thus here is OpenInMacVim.
git clone git://github.com/travisjeffery/OpenInMacVim.app.git
And drag that artistic-pulley-puller (app) onto your Finder's window.
And you if haven't then install scrooloose's NERDTree for best results.
See this link.
