I got this book along with The 4-Hour Workweek: Escape 9-5, Live Anywhere, and Join the New Rich and Attract Money and More: How you can begin enjoying a prosperous, happy, purposeful life...today. Overall I found it a very interesting mix of book. While my favorite is the Attract Money and More book, each is good in its own way.
What I liked best about this book is how "accessible" it is. As I read it, I got a ton of ideas that I could start right away. The problem (if you can call it that) is that they tended to be small, short-term ideas. I don't feel this is going to lead to a career change, at least not for me. However, I do have to remember that Hewlett-Packard started with a couple of guys building stuff in their garage and Microsoft was started by Bill Gates writing some software in his dorm room, so who knows?
Best idea I got from the book: My son turns 15 next month, so I'm going to have him read this and I'm going to work with him to make "entrepreneur" be his summer job next year. I think this book will help us get that started.
One other thing to add: If you are going to try to add a little side business, I recommend the 4-Hour Workweek to help you create the time you need to make it happen. And, if you really want to change the way you think about your career, money, and success, read Attract Money and More. That will help you make all the other stuff work for you.