I'm putting the finishing touches on my paper on badges for our panel tomorrow at the Digital Media and Learning Conference in Chicago, "Democratic Futures": http://dml2013.dmlhub.net/
In preparing I'm aided by two invaluable resources by Sheryl Grant and Kristan Shawgo, both part of our HASTAC and our DML bicoastal teams. They have put together a scholarly, annotated bibliography of 160 or so separate articles, studies, and op ed pieces on badges, representing the full spectrum of views: http://hastac.org/digital-badges-bibliography
And they have also curated another resource of blogs and other articles on badges: http://hastac.org/collections/digital-badges
If you are interested in the topic, these are the best resources available anywhere.