https://class.coursera.org/gamification-004
The second edition of the Gamification course taught by Prof. Kevin Werback (University of Pennsylvania) is live on Coursera. The course was very successful in his first edition (2012). It is currently half way through its programme but all the videos and assignments are available online and the lectures organise regular hangout meetings with the students. I find it quite engaging and fun to attend and presents a lot of interesting material.
-Matteo