I was in the audience for that talk, it was brilliant. Hofstader gave the second talk (first was Kurzweil) at the Singularity Summit, and completely yet classily trashed Kurzweil's talk, including his apparent failure to understand basic mathematics (of course there's no "knee" in an exponential curve, you can just rescale the axes to put the "knee" somewhere else).

Bad, bad haircut though.