Ah, after Apple's HTML5 fanciness website (http://www.apple.com/html5/), Google finally responds with a neato site! Btw, this is an excellent resource as well http://diveintohtml5.org/ (of course, the site refers to it as well)
The interactive demo presentation is very cool. I think there may be a small error, however, as the CSS transform associated with the "3" key seems to work everywhere in the presentation, and not just on the CSS transforms slide.