Phenomenal book. One of the best this year. And unlike some of the other related books I've read, this one is written by someone who understands all the physics (he's worked in the field for decades). Although he is fairly detailed about the physics, it's _so_ well written. My only ""gripe"" is that this book is so information dense that I'm going to HAVE to reread this one. Oh darn!
Update: and now I have! It was just as good the second time.