Recently, while gathering materials on a paper on accessibility in SharePoint 2007, I have stumbled upon an article by Roger Johansson about Web standards vs. Accessibility I have read a while ago. And although the article has been written back in 2005, it has opened my eyes on accessibility - once again. Are you sure that accessible web sites don't have to be valid?
WCAG 1.0 has been published back in 1999 by the Web Accessibility Initiative (WAI) of the World Wide Web Consortium (W3C). Since that time both the Internet and all the technologies have evolved. The Internet itself has got way different character: together with the commercial side, the social networking has evolved. The only thing that hasn't change so far are the accessibility requirements still remembering the good old HTML 3.2.