The discussion about the multiverse above was moderated by Paul Davies and there were five impressive personalities participating in it: Andrei Linde, Alan Guth, David Gross, Sheldon Glashow, and Alex Vilenkin. Two of them are Nobel prize winners, two of them may become ones in a few years, and the last one is not that infinitely far from them, either - sorry, Alex. ;-)
Update: Another similar ASU discussion about the origins of the Universe is here.Your humble correspondent knows all of of them well - except for Andrei Linde whom I have only met a few times. You shouldn't resist to watch. ;-) Despite the significant differences in the opinions about the multiverse, it is a no-nonsense discussion. No irrelevant hippie crackpots or computer administrator crackpots are included in it.