Dan Knauss's Projects
WordPress Advanced Administration Handbook. This handbook will have the most technical, general, documentation about WordPress.
WordPress Hosting Team Handbook
WordPress Develop, Git-ified. Synced from git://develop.git.wordpress.org/, including branches and tags! This repository is just a mirror of the WordPress subversion repository. Please include a link to a pre-existing ticket on https://core.trac.wordpress.org/ with every pull request.
Our book about WordPress. Version 2
Email users directly from WordPress by role using a published custom post type and wp-cron