This lecture was delivered at the Adam Smith Institute last week, on Prof Klein's paper "Mere Libertarianism", which I recommend reading. You can download the slides for the talk here, and watch a longer version with questions and answers here.
Prof Klein's new book, Knowledge and Coordination: A Liberal Interpretation, is one of the best non-fiction books I've read in a very long time. You can read my review here, and buy the book here.