Via @HTML5guy I came across the following Tweet:
Angry Birds built in HTML5? Sounds like A nice project, but I didn’t expect much. Programming in HTML5 is still quite hard, because of the lack of good tools. The tools for Flash are for example far superior to Canvas programming in Dreamweaver. But that’s food for another post.
Angry Birds in HTML5 plays just as it does on your iPhone or iPad, it is very impressive! Although it is probably built for Chrome (according to the URL), it runs fine on Safari and Firefox as well.
Take a look and try not to get addicted again. I totally agree with @elron8 that if we have a couple of showcases like this, HTML5 implementations will take another flight.