TED

TED or in other words Technology, Entertainment and Design is a global set of conferences owned by a non profit organization called  Sapling Foundation; formed to disseminate "ideas worth spreading."

This was founded in 1984 as an one off event. Since 1990 it was held as an annual event. Since then it has grown in to a global event.

What started as a conference where talks were largely on technology and design has grown into a conference with wide range of topics within the research and practice of science and culture.
 Large number of speakers who are researchers, politicians, philosophers, writers etc... have spoken in here.
 Since 2006 these talks have been offered viewing online. By mid 2011 the views have surpass 500 million.

To visit the site : TED.com