Freakonomics
The official website of Freakonomics, with information about the book, lectures on the book's content, and extras.
Freakonomics Radio
http://www.npr.org/podcasts/452538045/freakonomics-radio
Episodes of the Freakonomics radio podcast on NPR.
Steven D. Levitt
http://pricetheory.uchicago.edu/levitt/
Author Steven Levitt's professor profile on the University of Chicago's website.
10 Years On Interview
An interview with Steven Levitt and Stephen Dubner about Freakonomics, ten years after it was published.