From a list that I am a member of, I thought this was worth sharing. 

The first working draft of HTML5 has been published at: http://www.w3.org/TR/html5/

“…to make comments regarding this document, please send them to public-html-comments@w3.org. …All feedback is welcome…The publication of this document by the W3C as a W3C Working Draft does not imply that all of the participants in the W3C HTML working group endorse the contents of the specification…”

Public review and comments from outside the Working Group are needed, especially in regard to accessibility features.

“Differences Between HTML5 and HTML4″ has been published at: http://www.w3.org/TR/html5-diff/

The comments archive is at: http://lists.w3.org/Archives/Public/public-html-comments/

You can also comment on the HTML 5 Design Principles - W3C Working Draft 26 November 2007. http://www.w3.org/TR/html-design-principles/