One enterprising student, Scott Gibb, recorded all but the first two minutes of the talk I gave at Berkeley earlier this month. The sound quality is quite high. My talk is titled, "The Case For a Non-Interventionist Foreign Policy." It's here. Scroll down to under my picture and then click on the relevant link. (There are links to talks by Jeff Hummel and David Friedman also.)
My talk, which lasts about 45 minutes, is the lengthiest case I've made for non-intervention. In it, I apply the thinking of Hayek's information problem, unintended consequences, and public choice to the issue of intervening forcibly in other countries' affairs.