I stumbled across Malcolm Gladwell's The Tipping Point a year or so back. I just got my hands on his recent book: Blink. I'd characterise his work as popular psychology which focusses on small changes having significant outcomes. Blink is about those decisions that are made in an instant, the kind we don't think about. Intriguing stuff for thinking about much of educational practice. Gladwell, M. (2005). Blink: The Power of Thinking without Thinking. New York: Little, Brown.