This book is 240 pages but feels a lot bigger with three main sections - the beginning is an overview of the the different sections of the star wars galaxy which inevitably focuses on the history of the galaxy because it was settled in a series of expansions. The history is interspersed with sections detailing particular personalities or races (e.g. the Hutts) and particular issues (e.g. hyperspace lanes, politics, population density) as well as highly detailed maps of each section. Interestingly, almost half the galaxy is unexplored (due to lack of cleared hyperspace lanes) so there is room for story expansion.
The second part focuses on a planet a page detailing its history, solar system and all about its population. Again the detail is amazing
The last part takes every era of history - expanded universe and films - and follows the movements involved in the stories, system to system, with an accompanying map with lines following the character movements.
Throughout, the diagrams and pictures are bright, easy to follow and detailed and make the book attractive. My only criticism would be that for someone who is not familiar with the books, and over time this will increase, there is no cross referencing of systems with books, so if a planet sparks your interest you will have to do research yourself to read about it, and without a knowledge and interest in the Expanded Universe the book has limited use. Also, the Universe and films will continue to expand so the book will become out of date.
From a mapping point of view, I'm fascinated by how to map a galaxy, and this book is probably a good as you will get. There is a similar book based in the Star Trek galaxy (Star Trek Star Charts) which is more diagram based but less detailed and more confusing. This book definitely has it beat.