We've seen several examples of "Serious Games" that educate as much as they entertain. Here's another stellar example of interactive media for educational purposes. Darfur is Dying was created to increase awareness of the Sudan genocide. The site brilliantly uses gaming and video to put you inside the crisis, effectively conveying the rough situation to desensitized visitors.
Players assume the role of various Darfurians as they struggle to forage for water and protect the refugee camp from Janjaweed militants. The website then mobilizes players to take action through links to activist groups and additional information from non-profits such as Amnesty International. MtvU, the Reebok Human Rights Foundation, and the International Crisis Group have done a great job with this site.
For more serious games, see these prior posts:
Knuckles in China Land
Stingy's Spain 4: Subversive Bank Games