There are over 1000 videos like this in various forms: http://www.youtube.com/atgoogletalks
A lot of them are authors, but there are a bunch of other celebrities, musicians, politicians, and a ton of others. I'd recommend clicking on "Uploads" and then select "Top Rated."
So I ask you: are there any other such Google talks/chats like this worth watching? I believe there was one from a while ago with Obama, but I haven't really heard of any others.