Fascinating Happiness Presentations

I am currently reading Delivering Happiness which discusses how Tony Hsieh applied principles of happiness to build a billion dollar company, so I wanted to revisit some of the recent happiness research that is really fascinating.  Here are my favorite presentations on happiness research.

Watch it on Academic Earth

Lecture on Happiness by Dacher Keltner from Psychology 156 Fall 2008 at UC Berkeley: (Click on link for Lecture 29 and Lecture 30)