helpful flash game for those who've never played any of the populous games
not sure how much of the aspects this would cover out of the original games as its been quite a while since i tried playing one myself (partly due to a lack of info on how to even play, i.e. no instruction manual or guide) but i think this flash game covers the basics. heck, i think i'm around halfway or further and am getting by mainly with manipulating the elevations to expand my population real fast on each island.
http://www.kongregate.com/games/elec...plete=reprisal
behold, Reprisal, a flash game based on the old populous games :) bit on the easy side imo but still fun enough