I have a book that I kept called "Becoming a master student" by David B. Ellis ISBN:0-942456-10-6 that was the text for a college prep class I had in highschool. An overview, a survey, a preview, scanning, most books can be thrown out after this is done.
True. I've seen other books by Tony Buzan, Ed deBono, and Jean Marie Stine that also had these ideas. They're not new but they're also not as widely held or as common as you think. I wish they had books like that at my highschool...I had to go to the library and look under paranormal phenomena to find Superlearning by the Ostranders when I was 12.

Over 10% can be sucked out of a book with this very common technique. Yes it's very good, yes it works but no one owns it. It's not photo or speedreading. It's basic common sense.
Common sense isn't so common. And most people would probably be skeptical if you told them they could study a book in detail without reading every word and trying to memorize it all. That is just not necessary if you know the key concepts. Hence the strategy of PhotoReading.

What about the "hunches" and "feelings" and dejavu being just re-awaked schema (or previous knowledge) gotten through the Preview?
Makes perfect sense to me. Your brain's already associating the ideas you've previewed and activation will be easier then.