WP Source Control is a WordPress plugin that allows you to source control your theme directory and your posts/pages. You can even see how your theme has changed since your last commit using the diff function.
Please note that this plugin only works on UNIX/Linux OS. Unfortunately it doesn’t work with WAMP.
Built by The Marketing Mix Perth: http://www.marketingmix.com.au
This plugin is available for download to be used on your WordPress self-hosted installation.