What are the best guides to HTML5 & CSS3 support in web browsers?

Question

Do you know about useful resources about HTML5 & CSS3?

UPDATE:

I\'m (and i think a lot of people) looking for practical information how and to what exten

Answer 1

You can also take a look at HTML5 Laboratory which is my own HTML5 experiment site.

As mentioned above, HTML5 Doctor and Dive into HTML5 are two great resources.