There's a post in gamedesigners talking about a big game where each person is a nation, and each nation can make decision about how to trade, etc. Someone commented on it bringing up technology levels and such, military and whatnot.
This got me thinking that, if you were to play with real countries, whoever got to be the U.S. would be able to stomp anyone else if they wanted to. So, then I got to thinking, what about a game where everyone playing is a "little country", and the U.S. (and, now that I'm thinking about it, other world powers) are all controlled by the computer. So, basically, it would be a struggle to make your own little country try to have some kind of voice in the world.
Might be interesting.