Sussman at OOPSLA
Gerald Sussman is one of the contemporary luminaries of the field of computing, so I'm always interested to hear what he has to say. His most recent talk, delivered in San Diego last week at OOPSLA, defended the idea that programming is a good medium for expressing ideas that we don't yet fully understand. It forces us to translate from theory to practice in a methodical fashion.
The abstract for his talk can be found at the OOPSLA site, and a great summary and response to it was written up by Eugene Wallingford at his blog, Knowing and Doing.