If you want to play Civ4 in the most unique way I’ve ever seen, then head on over to Demogame.civfanatics.net. What do they do? They play a civ game where a group of people act as a president and cabinet controlling what goes on in the game. In other words, I play for a few turns and do stuff based on what we decided to do as a group. I’m guessing that they paint the broad picture and I get to do whatever in the details that gets us in that direction. It is certainly much more involved than the way my brothers and I used to play. It’s very neat and I suggest you check out their page to at least get a feel for how involved their rules are.