Category 1: - Simple Heuristics That Make Use Smart by Gigerenzer, et al. (http://www.amazon.com/Simple-Heuristics-That-Make-Smart/dp/0... (http://www.amazon.com/Simple-Heuristics-That-Make-Smart/dp/0195143817/ref=sr_1_1?s=books&ie=UTF8&qid=1322242265&sr=1-1)). I have heard good things about this book but have not read it yet. Category 2: - Think Twice by Mauboussin (http://www.amazon.com/Think-Twice-Harnessing-Power-Counterin... (http://www.amazon.com/Think-Twice-Harnessing-Power-Counterintuition/dp/1422176754)) - Influence by Cialdini (http://www.amazon.com/Influence-Psychology-Persuasion-Busine... (http://www.amazon.com/Influence-Psychology-Persuasion-Business-Essentials/dp/006124189X)) Category 3: - You already mentioned Michalko, but his other book, Thinkertoys, is also very good (http://www.amazon.com/Thinkertoys-Handbook-Creative-Thinking... (http://www.amazon.com/Thinkertoys-Handbook-Creative-Thinking-Techniques-2nd/dp/1580087736)) Category 5: - Switch by the Heath brothers is excellent (http://www.amazon.com/Switch-Change-Things-When-Hard/dp/0385... (http://www.amazon.com/Switch-Change-Things-When-Hard/dp/0385528752/))
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