A web application from the guys of deviantART. I'm pretty sure I've seen this before somewhere in prototype form. In any case, it's pretty cool, and it's completely done in HTML5, which means that it works on any modern, standards-compliant browser... including the iPad. No Adobe Flash nor any other plugins required.
The opening crawl, done in pure HTML and CSS. Note however that the only browser with the necessary standards support right now is Safari on Snow Leopard and the iPhone. Why did he do it? Because it can be done.