From a year ago, over at The Science Network (other videos of individual talks at the site):
Richard Dawkins, J. Craig Venter, Nobel laureates Sidney Altman and Leland Hartwell, Chris McKay, Paul Davies, Lawrence Krauss, and The Science Network’s Roger Bingham discuss the origins of life, the possibility of finding life elsewhere, and the latest development in synthetic biology. More than 2500 people filled ASU Gammage Auditorium on Saturday, February 12 to listen to this remarkable collection of scientists whose particular perspectives range from the cosmic to the microscopic.