We don't know how long Christopher Hitchens has as he battles esophageal cancer, but he's far from gone at the moment. What I wouldn't give for half his brain.
Berlinski is hard for me to listen to; he sounds puffed up and oblique, as though he's trying to make arguments too turbid to allow for rebuttal. (But maybe that's just me.) I suspect he would do better if he weren't arguing a position that thumbs its nose at rationality itself.
(The videos don't sequence automatically; one must go up to the Fixed Point video menu to find the other four videos.)