Interesting articles on HTML5

While this article goes beyond accessibility, a11y is included. The 
authors include some well-known a11y advocates.

http://www.zeldman.com/superfriends/guide/

And following some links, I ran across this blog post from Wendy 
Chisholm on HTML5 that is upbeat and hopeful.

http://sp1ral.com/2009/08/html-5/