Science for the Curious Photographer
You may remember that my dad, Charles Johnson, was working on a book that explains the science behind photography, from "quantum mechanics to physiology and art appreciation." He's finished now and while he negotiates with publishers he is making a limited number of copies available on CD, mostly to his photographer friends.
The book is beautifully illustrated with color photographs, diagrams and lots of equations. Yes, I said equations; you'll need to brush up on your physics and calculus to really appreciate the entire work. I really enjoyed the first couple of chapters and the later chapter on appreciation of art in photography, but I have to admit, I haven't read the whole thing.
I'll try again when I have the printed edition 
You can download a detailed table of contents via his blog photophys.com. He'll also be making selected chapters available there to get feedback; the first is How to get really high magnifications.