From the Introduction:

"Welcome to Macs Portable Genius. This book is like a mini Genius Bar all wrapped up in an easy to use, easy to access, and eminently portable format. In this book you learn how to get more out of your Mac by learning how to access all the really powerful and timesaving features that aren't obvious at a casual glance. In this book you learn how to avoid your Mac's more annoying character traits and, in those cases where such behavior can't be avoided, you learn how to work around it. In this book you learn how to prevent Mac problems from occurring, and just in case your preventative measures are for naught, you learn how to fix many common problems yourself.

This book is for Mac users who know the basics but want to take their Mac education to a higher level. It's a book for people who want to be more productive, more efficient, more creative, and more self-sufficient (at least as far as their Mac goes, anyway). It's a book for people who use a Mac every day, but would like to incorporate that Mac into more of their day-to-day activities. It's a book for people who pooh-pooh the notion that Mac users are a cult, but if someone decided to start an actual Mac cult, they'd join anyway. It's a book I had a blast writing, so I think it's a book you'll enjoy reading."