I think I actually found this website because of a link to it on here from Darood, but I thought I'd give it a thread of it's own.
I've found some really thought provoking talks on here and thought I'd suggest it to anyone on here not familiar with the organisation.
Here is the about blurb from the website.

TED is a nonprofit devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with two annual conferences -- the TED Conference in Long Beach and Palm Springs each spring, and the TEDGlobal conference in Edinburgh UK each summer -- TED includes the award-winning TEDTalks video site, the Open Translation Project and TED Conversations, the inspiring TED Fellows and TEDx programs, and the annual TED Prize.

And here is the link.
TED | Talks | List

Enjoy
Drew