Curriculum as platform
Groups have tools for sustaining the flow in playful ways and user groups are co-ops, helping everybody to contribute
http://www.ted.com/talks/jane_mcgonigal_gaming_can_make_a_better_world.html
With special tools, users curate the content based on shared values within user groups
http://www.tetris-project.org/
Materials are extensible, so users - students, study groups, developers - change them continuously
http://www.ted.com/talks/lang/en/hillel_cooperman_legos_for_grownups.html
Ways to contribute are simple, open and creative
http://www.ted.com/talks/joe_sabia_the_technology_of_storytelling.html
The platform has starter high-quality content
http://www.ted.com/talks/mike_matas.html