I love this one from Muhammad Yunus, Nobel Peace Prize winner and founder of The Grameen Bank...

http://fora.tv/2008/01/17/Muhammad_Yunus_Creating_a_World_Without_Poverty


I was surprised to discover that I enjoyed this talk given by Ben Stein as well...

http://fora.tv/2008/01/24/Ben_Stein_on_How_Not_to_Ruin_Your_Life