Time to plug NationStates again (I mentioned it back in December 2002, when I first discovered it). You can create your own country and have fun messing with it. I have two countries... the first one is Alathia, which was first founded on the 23rd of December 2002, then died (inactivity, I got bored with the game for a bit), and recently got resurrected; the second one is Elvians, founded on the 18th of July 2003, when I re-found interest in the game (thanks to some friends still talking about it, and the game finally getting some new issues for nations to decide on).
It's a fun game. Of course, right now I can't log in and play because they're apparently having database issues... ¬¬

I cannot endorse NationStates enough. Until NS2 comes out, then I'll be endorsing that.