Páginas interesantes de standares para diseñar aplicaciones web

HTML5:

http://www.w3schools.com/html/html5_intro.asp
http://dev.w3.org/html5/markup/elements.html
http://woorkup.com/wp-content/uploads/2009/12/HTML5-Visual-Cheat-Sheet1.pdf

CSS:

http://www.w3schools.com/css/css3_intro.asp
ie: http://www.iecss.com/
firefox: http://mxr.mozilla.org/mozilla-central/source/layout/style/html.css
chrome o safari: http://trac.webkit.org/browser/trunk/Source/WebCore/css/html.css
opera: http://www.iecss.com/opera-10.51.css