A nice little tutorial, Learning Canvas: Making a Snake Game, uses jsFiddle to walk you through demonstrations of creating a game on an HTML5 canvas.
The tutorial uses jsFiddle so you can view the code and run the example at every step. Great job, Chris!
Ian Langworth has been making web sites since before HTML had tables and Photoshop had layers. He wanted a single place to go for news and information related specifically to HTML5 and game development, but one didn't exist, so he started the HTML5 Grind.