The chart I referenced that compares the types of ADHD to hunters and farmers is from Thom Hartmann's book, "ADD: A Different Perception." The book is outdated, but well worth the read in terms of recognizing the positive aspects of ADHD as well as the serious issues.
A tremendous amount of neuroscience has been devoted to the study of ADHD over the past ten years, but I still like the book and its message.
It's an easy read.
Claudia