I frequently get asked about HTML5 and where to go to learn about it. I've gathered some resources from around the web here.
A tutorial about HTML5 and CS3 by Nettuts. Nettuts is an Envato company who also runs Themeforest, great themes.
Personally I really like Smashing Magazine's blog. This is their take on HTML5.
A table that shows the 104 elements currently in the HTML5 working draft and two proposed elements.
Open Video Player is a video player that encompassing the use of open standards and development methodologies in the development of media player applications.
An official Google blog post about HTML5 and how to get developers up to speed. The article focuses on another website called HTML5 Rocks
An introductory article about HTML5 by W3Avenue. They touch on subjects such as browser support and features, as well as include some examples.
Just a great site for diving into HTML5. My favorite section is the HTML5 Forms article.
This is a great starting template for html5. Really easy to understand, just watch Paul Irish's videos and you will be up and running in less than an hour.