It's a very interesting talk - but the title is misleading (title is the same in the submission as in the source). Norvig focuses on statistical learning and how that can be used to infer the meaning of words and the appropriate results in searches, particularly image searches. How these approaches tie into agile development, or any software development really, is given at best a cursory pass with a couple mentions that I, for one, wasn't able to follow. I kept waiting for the other shoe to drop and it never did.

I'd love to be told that I'm wrong or that I'm missing something here, so if anyone wants to enlighten me on the connection, please go for it.