Note: A better version of this lecture was given a few months later in Montreal, and the recording has much higher audio quality. You can find it here.
Jonathan Blow gave the closing keynote speech at Games:EDU South on July 29, 2008 in Brighton, England. This one-hour lecture is about three ways in which current mainstream games are inherently conflicted, and how this holds them back from affecting people as strongly as the forms of linear media they are striving to emulate. Art games are used to build a perspective from which to see this problem and maybe attack it a little bit.
You can download the lecture as a .zip file containing the PowerPoint slides, along with an mp3 of the audio:
Unfortunately the recording came out at a low quality; the questions from the audience at the end are difficult or impossible to hear, but hopefully the answers are detailed enough to provide clues as to the questions.