DIVE INTO HTML 5http://diveintohtml5.org/
html5.orghttp://html5.org/
[W3C]HTML5http://www.w3.org/TR/html5/
[W3C]HTML5 differences from HTML4http://dev.w3.org/html5/html4-differences/
HTML5中国http://html5cn.net/
W3school HTML 5教程http://www.w3school.com.cn/html5/
<html>5doctorhttp://html5doctor.com/
HTML5 (including next generation additions still in development)http://www.whatwg.org/specs/web-apps/current-work/multipage/
Google HTML5 ROCKShttp://who.is/whois/html5rocks.com/