Introducing Post Forking for WordPress. Fun project by Ben Balter to bring Github-style content collaboration to WordPress. It’s a simple v0.1 right now in the hopes of getting people using and contributing to it.
Use Edit Flow with files of any format. Neat integration coming up in the next release of WP Document Revisions thanks in part to the power of a strong open source community.
Why WordPress. Canonical document from Ben Balter listing nearly every rational for why you’d want to use WordPress for [insert web collaboration solution].