Google just released an HTML5 site offering demos and tutorials to developers. HTML5Rocks features nine tutorials on HTML5 features. And there’s a code playground to let you mess around with your own code. I like this set of introductory slides. Here’s how Google describes the site:

Because HTML5 and its related technologies cover so much ground, it can be a real a challenge to get up to speed on them. That’s why today we’re sharing HTML5 Rocks, a great new resource for developers and teams looking to put HTML5 to use today, including more information on specific features and when to use them in your apps.

One of the better HTML5 demos I’ve seen is this Time Zone page which was designed for the iPad. Keep in mind that there are no images at all on this page!