It's easier in a book type setting, no? I mean you get to sit around and think of questions, and you have just one guy, rather than two geniuses sat there right in front of you.
Indeed. (I deleted my reply because I had more to add to mononcqc's, but you were awfully quick on the draw!)
Also, I thought the _Coders at Work_ interviews were quite good (I've read about half, so far), but found the _Masterminds of Programming_ disappointing (except the one with Chuck Moore).