As a computer teacher I am always interested in reading books on a new subject, especially if the book is set up in an interesting and easy way. A book I use all the time as a learning tool and as a great reference is How to Cheat in Photoshop. It is written from the designer’s standpoint with real world examples. It comes with a CD full of the samples used in the book so anything that is used as an example, you can try as well. Give it a try!