Thanks for the quick response! If you can find the citation again among the sources you were reading, I'd appreciate it - perhaps you can add a footnote on the page RichardKennaway links.
Welcome to Less Wrong, by the way! I don't know if you read the About page, but if you're interested in rationality, etc., there's a lot of good essays scattered about this blog.
Sweet, there's another Bloggingheads episode with Eliezer.
Bloggingheads: Robert Wright and Eliezer Yudkowsky: Science Saturday: Purposes and Futures