Focal Press, a division of Elsevier, has published "The Photoshop Darkroom" by Harold and Phyllis Davis. This guide includes information on understanding Photoshop darkroom workflow and working with RAW files, enhanced editing skills and new coloring effects.
Using large, colorful images and step-by-step instructions, the Davises help photographers learn how to do masterly post-processing work. Both authors are widely published Photoshop experts, and Harold also writes for Photoblog 2.0 at photoblog2.com. "The Photoshop Darkroom" retails for $40.