http://www.ted.com/talks/lang/eng/dan_pink_on_motivation.html
Fascinating ted talk about intrinsic and extrinsic motivation and how they work when facing creative tasks. Very useful.
http://www.ted.com/index.php/talks/view/id/191
Sometimes called the "happiest man in the world," Matthieu Ricard, talks about happiness at TED.
http://www.ted.com/index.php/talks
Talks from TED conferences over the years.