From Edge.org:
KNOBE: Experimental philosophy is this relatively new field at the border of philosophy and psychology. It's a group of people who are doing experiments of much the same kind you would see in psychology, but are informed by the much older intellectual tradition of philosophy. It can be seen as analogous, on a certain level, to some of the work that you've done at the border of psychology and economics, which uses the normal tools of psychological experiment to illuminate issues that would be of interest to economists.
Experimental philosophy is a field that uses the normal approaches to running psychological experiments to run experiments that are in some ways informed by these intellectual frameworks that come out of the world of philosophy.
KAHNEMAN: I read the review that you were the senior author of in Annual Review of Psychology in which you dealt with four topics. It was all very summarized, and I don't pretend that I understood it all. I was struck by the fact that you run psychological experiments and you explain the results. There is something that sounds like a psychological theory, and yet, there was a characteristic difference, which I was trying to get my fingers on.
More here.