Building a world/campaign setting, at points, takes more time than making the actual campaign itself. I'm diligently working on my campaign setting/first campaign, though. I can't wait until I have enough so that I can show you guys and get your feedback.
I'd like to get everyone's opinion on something, though. What, in your personal opinion, is a _must have_ in every campaign? It can be anything. I'm just looking for some extra ideas/flare.