My stepmother's 10th book became available earlier this month, and this is the one I've been waiting for most eagerly ever since she mentioned the idea. She wishes should could've titled it "Photoshop: CSI" but that would've been too complicated legally, so instead it ended up being Adobe Photoshop Forensics: Sleuths, Truths, and Fauxtography by Cynthia Baron.
It's a fun, readable survey of image manipulation and fakery. How it's done, how to spot it, what Photoshop tools are used... full of examples and famous cases from history, the law, the news. Retouching models to make them prettier, cars to make insurance companies think they're damaged, or Hoodia export certificiates to fool web customers. Examples show you not only what software people use to manipulate these images and how, but what sorts of things you can look for to figure out that it happened.
P.S. Let me know if you buy a copy? And write a review on Amazon when you finish reading it!