Take a look on how Moodle will handle sharing files with consumer web apps like Google Docs and Flickr. Here’s some info about importing docs from external repositories:
http://mfeldstein.com/moodle-2-file-import-from-and-export-to-cloud-apps/
DawsonITE is a blog devoted to Educational Technology. It's compiled by Rafael Scapin, Coordinator of Educational Technology at Dawson College in Montreal (Canada).