The Emotion Thesaurus contains some opening material about characterization, showing versus telling, and using this thesaurus as inspiration and applying it naturally to characters and their surroundings. This opening material is nothing particularly new or ground-breaking, but I see how it's necessary--sort of a why-you-need-this-book combined with a disclaimer.
The bulk of of the text is made up of sections dedicated to many different emotions, where each section includes a list of ways to display the emotion. This is a pretty awesome and unique reference manual. I've been looking for books about facial expressions and body language, and this fits the bill, while also being directed toward writers.
I expect I'll keep this handy during my editing process.