What's the easiest way to install this? I have pathogen if that makes any difference...

Tangential, but you might like vundle (if we're looking at replacement plugins already) instead of pathogen.

Agreed, I was a pathogen devotee until I tried vundle. Never going back.

Another vote for vundle. Not having to manage git submodules is a nice change from pathogen.

git clone https://github.com/kien/ctrlp.vim.git cp -pr ctrlp.vim/{autoload,doc,plugin} ~/.vim