One of Google's big announcements this week was the launch of Chrome Angry Birds, a port of the hugely popular mobile game to Google's browser. But calling it "Chrome Angry Birds" is missing the point because what's really interesting is that it's a real-time multimedia cross-platform HTML 5 app. It runs fine in MSIE 9 and Firefox on Windows (sound and save games included) and I've heard reports it works in Safari on Macs, too. And because the game is based on open browser technologies, we can easily pull it apart and see how it's built just like we've been pulling apart web pages since 1993 via the magic of "view source".
The part that impresses me the most is the sound: that's been a weak point in browsers. Over on Metafilter someone pointed out that it was loading a small Flash shim, what appears to be gwt-voices. So still not a 100% Flash-free app, but very very close. The caching is quite sophisticated too.