Cool, thanks. I'm really trying to play with the rules a bit. Wizards, for example, are the religious centres of the tribes outside of "the cities" - they can hear "all the spirits", while the clerics of the cities "only listen to one".
I've got a few tribal groups set up in my head, most of them based off actual tribal groups in Mali (I've been reading a lot of ethnographies from the region; like I said earlier, Anthropology has ruined me!). We have a river-dwelling group that lives in huts *on* the water, a cliff-dwelling group similar to the Pueblo Indians, a Nuer-like group of pastoralists that raise cattle and occasionally raid, A "Villager" people that are fairly stereotypically "african", and, of course, mountain raiders (based off the mountain men from Mesopotamia). I also have seven city-states (a nod to Dark Sun) - Babylon, Thebes, Timbuktu, Tenochitlan, old Jerusalem, Constantinople, and a hodgepodge city based off Kabul.
The problem with all this, of course, is whether or not my players will bite. I think I might just spin it as "Dark Sun, only with water". That should get them at least a *little* bit interested. I'm also axing out most of the non-human races, which should actually attract my players - they're interested in playing humans, but sometimes feel like they're losing out because there are much stronger races out there.