Chrome Experiment has been coming out with heaps of incredible HTML5 canvas and javascript experiments. Thanks to all the awesome developers, most of the experiments are truly unique and jaw dropping. I could never imagine with the combination HTML and javascript can achieve such an amazing result. Take Tank World as an example, stunning 3d graphic, and it's a game! However, it will take year before most of the modern browsers fully support them, and also, I can feel the slowness when the browser loads and renders the graphic. So in the mean time, flash is still the best solution for intensive animation and web based game development.

Check out the list, preferably with Google Chrome. Mind you, some of them are pretty addictive :)