Ultimate Workshop is an excellent Photoshop Cs4 reference for the digital photographer, and one of the most useful and informative Photoshop books available.
The quality of the book and the sample photography is excellent, and as an advanced photoshop user for many years i did indeed find the book comparable to attending a power users training course, practical solutions to real world problems, emphasising good working practices throughout.
There is so much useful material here its difficult to know where to start, but they manage to pack in lots of advanced techniques to tackle many common problems, dealing with noise, creating depth of field, sharpening, simulating ir film, even removing color casts from underwater photography.
The authors have an incredible depth of knowledge, and theres plenty here to keep the Photoshop nerd happy. Many techniques present solutions to common studio problems, but nearly all can be applied to a variety of situations with a little bit of imagination.
The chapter on image optimization was very useful, and a great explanation of the controls in camera raw (directly transferable to lightroom users).
ultimate workshop makes a lot of use of the various new tools in photoshop cs4, and even demonstrates some very powerful uses of the extended version, and is a great way of getting up to speed for the intermediate or advanced user.
Overall a very inspirational book, which will inspire the photographer with some new approaches and even some complete new directions, especially the ability to remove noise, people or unwanted objects by combining new shooting techniques with powerful photoshop tricks. The authors make reference to how camera techniques and set-up can avoid some problems, or improve some creative techniques.