Helps you craft well formed commit messages with magit’s log edit commit. Directives for what makes a well formed commit come from tpope: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.
Install package from http://melpa.milkbox.net/#installing
M-x package-install RET magit-commit-training-wheels RET
(require 'magit-commit-training-wheels) (ad-activate 'magit-log-edit-commit)