@ Acularius: I think it is a bit early in the process to talk about the details of the resource system, especially since we are still lumping together everything in one thread. But since you brought up the subject, let me try to, as briefly as possible, add my thoughts:
My dream game would distinguish, obviously, between finite resources and renewable resources. Finite resources are iron, coal, oil and the like. Renewable resources are products of agriculture and farming, like wheat or sheep, the silk produced by domesticated silkworms, and so on.
All resources would be quantifiable. With a finite resource like iron or oil, you would have a certain number of units on a tile, depending on how large or small an iron ore deposit or an oil field is.
The production of a renewable resource per tile / per turn would depend on things like soil quality (for agriculture), production tech and so on. Also, unlike finite resources, renewable resources would be able to spread. To begin with, there would only be "wild" resources - wild horses, wild sheep, wild wheat, wild rice and so on, in the places where they evolved naturally. Early in the game, when a civilization has discovered the required tech, such resources could be domesticated. For instance, you domesticate wheat, and from then on are able to grow wheat on any of your tiles that has the required climate and soil. Once one civilization has domesticated a renewable resource like wheat or horses, the knowledge of it will slowly spread to neighbouring civilizations, as it did in real history.
I think it would be fascinating to have agriculture, domesticated animals etc. spread from a few "cradles of civilization" as they did in real history. But what about those civilizations that are not so lucky to start out in a cradle of civilization, where no good "resource package" of wild grains and wild animals suitable for domestication exists? Would they not be disadvantaged? Initially, yes, but ways could be designed to make them playable nonetheless, so that they can catch up later and maybe even overtake the early cradles of civilization. I have thought about this in some detail as well - but this is really stuff for another post.