Big Think is a really cool site. It's a new medium for doing what humans have been doing since the beginning of their existence, just talking to one another. What's cool here is the intuitive design and categorization of the topics. Sam Harris and Ayaan Hirsi Ali have popped up in the section Faith & Beliefs, and I'm sure there are plenty of other experts in the other fields. It's hard to describe why this is cool without seeing it for yourself. Go check it out. It seems like a wonderful manifestation of everything free speech is meant to be.