For the Whyday, I've hacked two ZSH scripts for completion of RVM and bundler 1.0. You can find them on my dotfile repository on github: http://github.com/nono/dotfiles/blob/master/zsh/Completion/_rvm and http://github.com/nono/dotfiles/blob/master/zsh/Completion/_bundler. To install them, you can put these 2 files in $HOME/.zsh/Completion (create this directory if it doesn't exist), and add it to