Dude, forget Klein. I mean, he's a total badass, and I can't wait to hear episode 4 (I listened to 3 twice this week), but go back through the archives... Roberts did a two-part episode of Milton Friedman awesomeness back in 2006. And only slightly less spectacular are his interviews of Mike Munger. Munger's bit on recycling is a good smackdown of greenie stupidity.
According to the blog, it will be more like six episodes. They got bogged down pretty badly in part III of the book, and they didn't finish it in episode 4. Check out
www.cafehayek.com for blogs from Roberts and Don Boudreaux.
And in case anybody is curious, Roberts is a CCW = less crime advocate. He has stated it in as many words.