Love this talk by the designer of evoke: the ten-week crash course in changing the world.  Besides her breakdown of what gamers are good at, she nails a critical point: games can give you lots of characters who are willing to TRUST you and match challenges to your level–providing collaboration, feedback, and an engaging story–something we all need more of.  She ends with a a better tactic around futurecasting: imagine the best scenario possible—then empower people to achieve it.