FYI, I use pathogen and git submodules for my plugins...
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CoffeeScript? Here you go: https://github.com/kchmck/vim-coffee-script
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Rails shortcuts and tools: https://github.com/tpope/vim-rails
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Fugitive, a wrapper for git: https://github.com/tpope/vim-fugitive
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Gist-vim, post public and private gists: https://github.com/mattn/gist-vim
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Surround, change double quotes to single quotes, etc.: https://github.com/tpope/vim-surround