The Future of the Brain, by Steven Rose

I'm departing briefly from the topic of autonomics to mention that this book is great. The first couple dozen pages on evolution (in the beginning of Chapter 2) are alone worth the price of the book - everything from how single cells do things, to a brief discussion of symbiogenesis, to limitations on size, an evolutionary process called exaptation, and "homeodynamics" (which he suggests is an improvement on the term "homeostasis") then he starts to discuss the evolution of the brain itself.