Thanks for the feedback, Dan. MoodleNet will be content-agnostic, so I've updated the blog post to read:
"We are, however, planning to create a repository for Moodle-specific resources and activities such as quizzes."
Hope that clarifies things
For reminder, I've put a comment into first google doc draft (but I can't find it anymore) about a french initiative for a national questions bank :
It's a free bank and a user can backup the activity in his own moodle. It's with CC licences and authors are paid for contribution.
If you want some screenshots, I can do it.
And there is also some other resources like courses...
Hope this project can inspire