Even the people at Mozilla Open Badges on the FAQ section on their wiki are asking "how does introducing badges affect learners' motivations? If learners were already intrinsically motivated, how do we avoid 'crowding out' those motivations with an extrinsic badge system?"
For the next few days I'm on a quest of my own. I'll be reading and writing about what educational research has to say about motivation and how that might inform the use of badges in the classroom, I'll be talking to some people who know more about these topics than I do, and I'll be browsing websites like gamifyingeducation.org and the gamification wiki.
In the meantime I'm wondering what people think about badges in education: what effect do badges have on learners' motivation?