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Eliezer Yudkowsky and Will Wilkinson. Due to a technical mistake - I won't say which of us made it, except that it wasn't me - the video cuts out at 47:37, but the MP3 of the full dialogue is available here. I recall there was some good stuff at the end, too.
We talked about Obama up to 23 minutes, then it's on to rationality. Wilkinson introduces (invents?) the phrase "good cognitive citizenship" which is a great phrase that I am totally going to steal.