Speaking of Git commit messages, it's worth pointing out this wiki[1], written and reviewed by some long time open source contributors. It's a bit verbose, but rewarding to the patient reader.

On writing Git commit subject lines, I've come to appreciate why the imperative mood is nicer (as opposed to the and indicative mood). Some related reasoning here[2].

[1] https://wiki.openstack.org/wiki/GitCommitMessages [2] http://chris.beams.io/posts/git-commit/