Technology, Entertainment, Design: Ideas Worth Spreading: http://www.ted.com/
Essentially, they have a conference every year, and are now putting the talks up online. There is some really cool stuff on here.
Here's some samples:
Chris Abani talks about language and the stories of Africa.
Pamelia Kurstin is the most adorable theremin player EVER.
Dan Dennett talks about memes and parasitic "ideas to die for."