Jason Welsh (@cannedmushrooms/www.jasonwelch.com) has a collection of great video tutorials for Moodle, including this great Database tutorial and suggestion for use as a way for students to collaborate in groups and how to grade it using the offline activity (~9 minutes; seen below).
Check them all out at http://www.veoh.com/group/moodle-
Watch 0015 Moodle Database.mov in Educational & How-To | View More Free Videos Online at Veoh.com
Here’s a list of all the videos:
View More Free Videos Online at Veoh.com
http://www.veoh.com/group/moodle-