Bumping this, very good video and I recommend these a lot. Crazy stuff. Ranges from philosophical stuff like that one was to some other crazy ideas.

Controlling The Brain In Real Time. Very cool.
TED | Talks | Christopher deCharms: Looking inside the brain in real time (video)

Ken Robinson on how schools kill creativity. Great one.
http://www.ted.com/index.php/talks/view/id/66
12 sustainable design ideas from nature. Another great one.
TED | Talks | Janine Benyus: 12 sustainable design ideas from nature (video)