Ben Wilkoff, who runs LearningisChange.com has a great post that highlights the 8 steps of Moodle/Google Apps integration. This is one of the best extensions created in 2009 for Moodle and it’ll go a long way in extending the collaborative nature of Moodle through the use of Google Docs.
Visit http://learningischange.com/2009/02/25/the-killer-app-google-apps-and-moodle-integration/ for more information or to try the extension yourself. You will need your own domain setup for Google Apps to proceed.
From the post:
I am amazed at the potential for something like this. Imagine being able to log into your classes, your e-mail, your sites, and your docs all at one place. Well, after much working on my own installation, I would like to provide a simple how to for making this process happen in your Moodle instance.