I was really interested in reading The Second Brain by Michael Gershon, but then I worried it might be a little over my head when I read some of the reviews. Also, it was published in 1999, and surely we've learned since then?
I have The Paleo Solution by Mr. Wolf and also Nora Gedgaudas's Primal Body, Primal Mind. I haven't had a chance to dive into either of them, though I've referenced them for specific topics. So if there are good sections in those I should look at, let me know.
Anything else out there I should check out?