I'll chime in to support Tim Ferriss. I read the 4-Hour Workweek in college and started a few businesses based on the model he described. One of them worked fairly well and is now my primary source of (largely passive) income. I've also had excellent results from the 4-Hour Body.

More generally, his general writings on "lifestyle design" (basically applied Epicureanism) are a great if not really mind-blowing source of insight. He is a fantastic salesmen, but being good at sales is actually not a bad or scummy thing, in my opinion. He has helped a lot of people, (like me) and I think he deserves credit for that.