You might have already heard about TED, after all, it's in it was founded in 1984 and quickly became a one of the crown jewels on the Conference Circuit -- for all the right reasons.
During the past couple of years, TED has started doing something I think you need to know about: It is posting videos of its presentations and making them available to all, free of charge. You can see for yourself here. I highly recommend you traipsing over there, finding something that strikes your fancy, and find out why TED is an invitation-only, $6,000 ticket.
