This is an oldie, but a goodie. You can tell because it is in 4:3 and makes this entire page look like crap. Anyway, still one of my favourite TED talks, aspect ratio aside. Intelligent, future friendly architecture & design, with many applicable ideas (a rarity in this field, even today) - and all of this was said 7 years ago.

Edit May 1, 2013 - So that link died, here is a better one anyway: