There are a few books by this guy, Scott Kelby who is the editor-in-Chief of the Photoshop Magazine published by the Nat'l Assn of Professional PS Users (or something similar) in USA. One of them is the "Dirty Tricks" mentioned earlier in the thread. He has, I think 3-4 books on PS7, the latest is "The PS Book For Digital Photographers". Highly recommeneded as he writes by way of eg meaning you use any photo you have & run thru the steps to get the effect. You do not have to know PS but it works and each time in future, follow the same steps. Of course you learn to apply the sreps somewhere else instead. I believed the library has all his books.
I am using this book called, "Adobe Photoshop 7.0 studio techniques". by Ben Willmore. It is depend on personal preference whether you will like it or not. Personally, I found this book quite "basic", nothing fancy, but more "theorectical" than most "practical" books.