I'll need some time to fill in my reasoning in an other post on macroevolution and information theory to answer Matt and George. Currently I simply want to enter a link on evolutionary psychology, which indicates its just-so stories have reached an end point where the critics are booting it out of scientific discussions. The early work on hunter-gatherer group dynamics I thought was right on and I still see traces of our stone age brain in societal problems at very basic levels. See Robert Wright: "Non-Zero", 2000. - http://www.newsweek.com/id/202789