There are actually seven:
Luke Muelhauser of the Machine Intelligence Research Institute interviewed me about how to do research.
Maria Mannone interviewed me on her blog Math is in the Air.
Greg Bernhardt, who runs a discussion website called Physics Forums, did a pretty extensive interview about my life and work.
The mathematical physicist Bruce Bartlett interviewed Urs Schreiber and me about our blog with David Corfield, called The n-Category Café.
Helen Joyce, editor of Plus Magazine, interviewed me about two number systems I like: the quaternions and octonions.
A high-school student named David Morrison had to interview someone for an assignment, so he sent me some questions, which I answered.