This is interesting. I read Guns, Germs and Steel a few years ago, have re-read it a couple times since, and found it very persuasive within certain boundaries (post-hunter-gatherer and pre-state; after that Victor Hanson's theories of how societies evolved make far more sense when all the facts are considered, before that Jared tends to romanticize just how awfully brutal and pointless hunter-gatherer life must have been).
Jared's a great writer and scientist, but he's definitely succumbed to a bit of Luddite madness. What a shame.
Sigh. Two great authors shatter my illusions about them in one week.
(h/t to the indispensable Pixy Misa)