Each year for the past ten years, the Edge Foundation has asked leading intellectuals and thinkers, from Brian Eno to Richard Dawkins to Tim O'Reilly for their thoughts on a particular question.
The 2008 question is “What have you changed your mind about? Why?”
You can also find an archive of previous questions such as…
2007 – “What Are You Optimistic About?”
2006 – “What Is Your Dangerous Idea?”
2005 – “What Do You Believe Is True Even Though You Cannot Prove It?”
…going back all the way to 1998.
And it appears that they're now producing books based on the question so if you're doing any collection development for your library, you might want to consider purchasing them.