Guerillartivism.net

Sir Ken Robinson on learning and creativity.

Richard Baraniuk on global free online education.

Steven Levitt on gangs, crack, cocaine, McDonalds and economy.

Dan Gilbert on synthetic happiness.

Michael Shermer on skepticism, pseudo-science, etc...

Peter Donnelly on interpreting statistics (Sounds like my stats class ;)

Ray Kurzwell on technology, growth and the singularity.

Kevin Kelly on the evolution of biology and technology.

Robert Wright on the evolution of complexity in life and technology

Here is an interesting podcast from the EFF's founders:

"John Perry Barlow and John Gilmore were welcomed by Cory Doctorow, the U.S. - Canada Fulbright Chair in Public Diplomacy, for a discussion and q&a regarding their careers as cyberfighters and early adopters of the Internet."