Scott

This is an excellent book to explain a well known, but little understood formula. It begins by explaining the history of each of the characters (E, M, C, = etc...) From there it goes on to explain how this formula relates to everything from an the A bomb, to the future of the solar system. This book does a good job of trying to explain some very complicated ideas without getting to deep into the subatomic details. If you want a simple understanding, then this book is the right choice for you.
One noticable flaw with hearing the book is the lack of illustrations and the often given reference to the authors website. If you have trouble reaching his site, do a search for the authors name (David Bodanis) and you'll find his site with all the information promised.