Ajax Animator, a basic animation tool in HTML 5 for the Chrome web browser…
“Ajax Animator is a web-based animation tool powered by HTML5. There are plenty of customizable options in this app including various themes, drawing tools, frame layering, image uploading and setting up the speed of your animations. With Ajax animator you can save, publish, upload and share your animations. Ajax Animator allows you to work offline.”
An interesting vision of what you can build with HTML5.
Canvas Rider also shows the possibilities for crowd-sourced platformer games. This is where HTML5 will win out, I think — not trying to compete with polished commercial desktop apps, but in creating new semi-social / data-driven online experiences that go beyond silly Facebook and Flash games.