Bret Victor does cool stuff. He designed the first UI for the iPad. He created interactive graphics for Al Gore's iOS book. And more to the point, he created a mind-popping personal website, which is how I know all that.
Victor's personal homepage, worrydream.com, is a remarkable example of the Web in action. Go ahead. Explore. The Kill Math section is particularly mind-blowing. Oh, and also? Hashbangs, baby. Hashbangs.