This year's GDLM 1st years are having to do a combined eLearning and Dimensions of Learning course, part of which is setting up an ePortfolio. I've offered to help tutor for the subject since I really liked the eLearning component last year and it's been pretty fun so far (albeit a bit lacking in time due to work commitments and my own assignments). I'd fiddled with a couple of the ePortfolio systems before, including the Mahara demo, and lamented about the lack of attribution that is currently on offer.
I finally bit the bullet over the weekend and set up my own ePortfolio over at Netspot (CQU shadow system). After using the system for a while it seems a little easier to get around the interface, but the integration to Moodle is the closest thing to attribution I can see. Going to have to dig into how they are doing it to see if there's any fundamental point of validation that can be translated to other web groups/organisations.