I just completed week 4 of 6 of the Gamification course you tipped us off to. It's been really outstanding, and will definitely not be the last Coursera class I take.
The only problem I've run into is that part of your grade is a result peer assessments, and if you wind up with a non-native English speaker, or an individual with poor reading comprehension or critical reasoning skills, you can lose points without cause. Overall, though, quite valuable. Thanks!