A wiki is a very flexible and great way to detail at least the text bits of a campaign setting. I presume that we will all pile into this wiki and edit it too ? The way I see it running in general is that somebody maps a bit - like each of the tile owners and then writes up about the areas on that map. Then anyone can take one one of those bits, like a fort for example, create a map for it and then write a wiki page or three about that map. Then somebody else takes a house or whatever and does the same again. The person creating the map usually has a pretty good idea about whats down there at the time he makes it.