I didn’t know if this would be helpful but SitePoint has been putting together an “HTML 5 Development Center”
The only thing that made me “raise an eyebrow” was that the banner on the page says “Developed in part for you by Internet Explorer 9” and evidently Microsoft has been assisting in the project.
But the good news is this statement on this page:
The HTML5 Dev Center is browser neutral, these are growing technologies and the browsers are always evolving and updating.
In general I really like SitePoint’s reference material, so hopefully they will live up to the browser neutrality policy… 😉