Another vote for Katrins book. Be sure and look for second edition. It has
PS 7.0 included. Also notice Doug is one of the technical reviewers and some of our own RetouchPro people are represented. See page 181. Sorry for the self promotion but I am proud of being included.
Katrin is also an extremely nice and helpful person. She has always responded to my pleas for help in a very timely and helpful manner. I feel "Photoshop Restoration & Retouching" is a must for anyone, amateur or pro to have for reference. Its the retouching classic.
Bob