This is taken from The Singularity Summit symposium hosted by Stanford University, where a good number of speakers about this topic gave keynote addresses. My goal was to have them all posted in the same place, in order for people to easily find them, and I was in the process of doing just that, but due to the queue, Sunkid got to this one first. Here's the rest of the info I already had prepared to go along with this.

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Eliezer Yudkowsky - The Human Importance of the Intelligence Explosion (Full Title)

The Singularity Summit symposium hosted by Stanford University was a series keynote addresses given with the purpose of addressing the very real implications that the Singularity may hold in the near future in an academic setting, and (without being too melodramatic on my part) to question what the very fate of the human species may be in the 21st century.

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Here are the rest of the keynote videos that go along with this, in the order that they were given at the event.

Ray Kurzweil - The Singularity: A Hard or Soft Takeoff?
http://www.videosift.com/video/Ray-Kurzweil-The-Singularity-A-Hard-or-Soft-Takeoff

Douglas R. Hofstadter - Trying to Muse Rationally about the Singularity Scenario
http://www.videosift.com/video/Douglas-Hofstadter-Musing-Rationally-about-the-Singularity

Nick Bostrom - Artificial Intelligence and Existential Risks
http://www.videosift.com/video/Nick-Bostrom-Artificial-Intelligence-and-Existential-Risks

Sebastian Thrun - Toward Human-Level Intelligence in Autonomous Cars
http://www.videosift.com/video/Sebastian-Thrun-Human-Level-Intelligent-in-Autonomous-Cars

Cory Doctorow - Singularity or Dark Age?
http://www.videosift.com/video/Cory-Doctorow-Singularity-or-Dark-Age

K. Eric Drexler - Productive Nanosystems: Toward a Super-Exponential Threshold in Physical Technology
http://www.videosift.com/video/Eric-Drexler-Productive-Nanosystems

Max More - Cognitive and Emotional Singularities: Will Superintelligence come with Superwisdom?
http://www.videosift.com/video/Max-More-Will-Superintelligence-come-with-Superwisdom

Christine L. Peterson - Bringing Humanity and the Biosphere through the Singularity
http://www.videosift.com/video/Christine-Peterson-Humanity-Biosphere-the-Singularity

John Smart - Searching for the Big Picture: Systems Theories of Accelerating Change
http://www.videosift.com/video/John-Smart-Systems-Theories-of-Accelerating-Change

Eliezer Yudkowsky - The Human Importance of the Intelligence Explosion
http://www.videosift.com/video/Eliezer-Yudkowsky-The-Intelligence-Explosion-and-Humanity

Bill McKibben - Being Good Enough
http://www.videosift.com/video/Bill-McKibben-Being-Good-Enough

Ray Kurzweil - Stanford Singularity Summit: Closing Thoughts
http://www.videosift.com/video/Ray-Kurzweil-Stanford-Singularity-Summit-Closing-Thoughts