I found this interesting site from Mitali's blog and created my own nation "The Free Land of NerdIndian".
NationStates is a nation simulation game. You create your own country, fashioned after your own ideals, and care for its people. Either that or you deliberately torture them. It's really up to you. Jennifer Government is a novel by Max Barry, on which NationStates is based. The book is set in an ultra-privatized world, of the sort you can create in NationStates, if you're mean enough. For more information check out www.maxbarry.com.
You create a Nation and follow it from there. You'll be asked to choose a name for your nation, a motto, a national animal, and a currency. Then you answer a short questionnaire about your politics. This will determine what sort of nation you end up with: authoritarian or permissive... left-wing or right-wing... compassionate or psychotic... you get the idea.
Overall, a very nice site for someone interested in international politics / civics.