Discovery network just ran a long program this week, a tie in with the new animated movie Ice Age, called Real Beasts of the Ice Age The paleo part was their examination of a fictional Australopithecine tribe...they talked (to my great delight! made me look up from the work I had taken home and actually listen!) about the relationship between meat eating and the evolution of intelligence, how the former drove the latter--both the theories about the inverse relationship between gut length and cerebral cortex size and the theories about how throwing weapons to kill meat helped our ancestors' brains develop.

If you're interested on reading more on these theories, there is info at www.beyondveg.com and more at Wm. Calvin's website...and of course you could do an internet search.