9elements, who are totally awesome btw., released an impressive HTML5 Canvas demo yesterday:

HTML5 is getting a lot of love lately. With the arrival of FireFox 3.5, Safari 4 and the new 3.0 beta of Google Chrome, browsers support some great new features including canvas and the new audio/video tags. Most interesting: modern mobile devices like the iPhone or Android-based phones also support new standards in favor of Flash. The future looks bright for HTML5.

Take a look at http://9elements.com/io/?p=153