Well, Photoshop guru Matt Kloskowski has written a concise introductory guide about using layers, the heart of Photoshop Elements and Photoshop CS series. His book is appropriately titled, Layers: the Complete Guide to Photoshop’s Most Powerful Feature. For this book, Matt incorporates Scott Kelby’s trade mark style of explaining Photoshop layer features and techniques in a well illustrated, step by step process. Each lesson is explained in less than five pages with no more than two paragraphs per page.