Just as a remark, I'd like to put two links here that deal with the subject of using games in learning and teaching. I see an enormous potential, but I'd like to dive in a bit more before getting to conclusions. Please comment in case you have some idea or other references:
A book about it Games and simulations in online learning: research and development frameworks
An article discussing the fear of games: http://net.educause.edu/ir/library/pdf/eqm0830.pdf
Another great one: https://www.iste.org/Content/NavigationMenu/EducatorResources/YourLearningJourney/CreativityandInnovation/jrte-40-1-023-gro.pdf
Now, some focus on useful games: http://www.gamesforchange.org/
Another great example of using games is showing abuse felt by some people and letting the whole world know about it. I personally enjoyed the idea of Darfur is Dying. Check the cool game here.
It seems Channel 4 has some experience in it: http://www.channel4learning.com/
There's an article about it here: