I heard about this concept and was just wondering if any one has use it. I wont ask what was the idea as it will become common then. So has anyone of you have done Black Hat PPC
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Blackhat is a subjective term nowadays. There are plenty of techniques that many would consider blackhat that are certainly not "illegal" as many people on this forum seem to think. Blackhat usually just means you're going against a particular sites terms of service in a sneaky fashion. Cloaking is one big example.
It's a great eBook and I learned a lot of great techniques from it, I have a copy if you would like it.