There is more stuff evolving faster than can be published in a book. For example, Google changes their parameters constantly.
Despite what you might hear, nobody really knows how SEO works, but there are common techniques that usually work reasonably well. A good place to hang out is Search Engine Watch. They have a blog and active discussion forums there.
Not only that, you should subscribe to his website and participate in his discussion. He's really friendly, and will answer your questions too.