I can only talk too much about ted, here are the two most recent talks that have got my juices flowing. And in my opinion compliment each other too 🙂

If the embedded version doesn’t work, here’s a direct link
and:

direct link again
Also if you missed the last TED video that I ‘dug’ here’s a link to that too.
That’ll give you about an hour (if you watch all three) of complete fascination.