Another excellent Steve Johnson book,
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This review is from: Brilliant Photoshop CS5 (Paperback)
Information very well organised with each topic covered in a 2 page segment with step by step. Well indexed. You can use it as a reference, dip into it, or work through it as a training manual. Very visual layout, lots of screenshots. It's actually possible to read it without the application open due to the use of screenshots. Reasonably priced compared to many adobe manuals.