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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.

Installation:

1) Install WordPress 3.4.1 or higher

2) Download the latest from:

http://wordpress.org/extend/plugins/tom-m8te

http://wordpress.org/extend/plugins/wp-source-control

3) Login to WordPress admin, click on Plugins / Add New / Upload, then upload the zip file you just downloaded.

4) Activate the plugin.