Thanks for posting a walk through of the protoype - great to see the idea looking more tangible.
Here are some rambling thought and queries that come to my mind:
It strikes me that having a companion a browser widget (perhaps stumbleup esq?) could be realIy neat. I could see a user flow where you get to a resource (eg. youtube video) and then see in the browser how it's rated amongst your peers as a learning resource and then add it from there into your moodle.
Is there a particular target demographic for the platform? as I could see that the features that would be really useful to a secondary teacher (perhaps mapping to a particular syllabus etc...) and university academic might be different.