Check out the video about the private resource block below (direct link: http://www.youtube.com/watch?v=UwQcoCOfYlU)
Looks to be a great student portfolio system fully integrated into Moodle “out-of-the-box”.
Gavin has highlighted that and more through narrated screen casts and videos at http://moodle.drupalgardens.com/. Well worth a visit if you want to see what’s cutting edge from Moodle 2.0 (out this July!).