A proof-of-concept vim plugin manager based on pathogen.
First make sure that you have vim-pathogen installed.
Then from the command line:
$ git clone https://github.com/seanewest/vimup
$ cd vimup
$ gem build vimup.gemspec
$ gem install ./vimup*.gem
vimup tpope/vim-rails
vimup down vim-rails
vimup list
vimup user seanewest/vim_config