O(n lg n) is a tumblelog.

Commit Editing with VIM (Keyboard Shortcuts)

On the 365Git blog there is a nice simple post giving the common vim keyboard shortcuts for doing commit messages with

Git defaults to using vim to input a commit message (though you can change the editor easily), if you don’t supply a commit message with your commit. I personally try to keep my commits small and use `git commit -a -m` when possible, but if you need to write a commit message of any significant length these keyboard shortcuts are good to know if you are going to stick with vim.