Having given a shout out to faavoriteapp I feel obligated to also mention Eric Rowell's HTML5 Canvas tutorial site. The man has created a tutorial site and JS library that goes a long way to combining the features of Illustrator and Flash into HTML and JavaScript. He's also written a book to go along with it. Awesome project and he deserves some serious recognition for it.
HTML5 and KineticsJS
html5canvastutorials.com