Dongsheng - I am creating this issue realizing that it may eventually get bounced to CONTRIB. Connexions is a repository or learning objects similar to Merlot that encourages Creative Commons licensed content. They use Rhaptos, an open source repository, and I have spoken with them about developing a Moodle plugin that would allow teachers to find resources to include. I'll reference this issue with them and see if we can get them working on providing the needed information to create the repository plugin. At this point, I don't see any need for you to do anything but I wanted to have an issue to reference. There may be a couple plugins warranted here because of the flexibility with where content can be (similar to Flickr and Flickr public). Content hosted on cnx.org could be considered public but they also allow the installation of rhaptos and organizations can build up their private repositories as well. Peace - Anthony