Timothy Ferriss offers a unique perspective in his book The 4-Hour Work Week.
This book definitely forces you to think in a new way. Our biggest problem with it ... Timothy doesn't spend enough time explaining that he worked 80 hours a week for years to create the business before he introduced systems that allowed him to work much less. It *seems* to us that many readers forget that and just want to work 4 hours a week right from the start ... that's not the way things work.