Vim Scrapbook
Intro: http://www.viemu.com/a-why-vi-vim.html
Other good web pages:

Vim key bindings for Cocoa (Mac): http://www.corsofamily.net/jcorso/vi
Reflow a paragraph: go to the first line then type gqap
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What each key does:
http://www.viemu.com/vi-vim-cheat-sheet.gif