This book is the complete package. It contains a DVD that provides all three versions (Windows, MAC, and Unix) for GIMP. In addition there is an introduction to GIMP 2.8 which is currently under development. And last, but hardly least, the images used in the book’s tutorials are included.
The book progresses in an A to Z fashion in teaching one about GIMP. In addition to the “how to” instruction, there is sufficient, but not overwhelming, information on theory, the “why” part of processing.
GIMP is the “high end” of free photo processing software and approaches Adobe CS 5 in its capabilities. Even if you are not on a budget, consider GIMP. And if you do, or if you are currently using GIMP, add this book to your library. You’ll be glad you did.