eBackpack offers storage and collaboration features to individuals, classes, teachers, and schools. Now, there is an iPad module to help manage workflow and student portfolios. The pricing is quite affordable.
Created by the people who made Vimeo, DIY is an open tool for kids to make their own digital portfolios and for parents to have a login to the account. Using the app and the web, kids can save all that they create. This is definitely worth exploring when thinking about extended learning environments.