Foreign Policy and Prospect have released a list of the "Top 100 Public Intellectuals." The list is dominated by political scientists, economists, and journalists, but also includes many working in the natural sciences and a few of the world's "most introspective philosophers" (the most impressive kind).
The whole process of picking a "top" public intellectual is a little ridiculous but it's fun to browse their bios. Anyone you think really should have made the cut (other than Bill O'Reilly, obviously)?