Not sure how useful this site is going to be, it's for members only and you need to be in the public sector to be a member. I'll need to come back next week.

Unpicking WCAG 2.0 a thorough observation.

Official accessibility guidance updated to allow either WCAG 1.0 or WCAG 2.0 as a minimum standard for public sectors sites.

Oct 2009 survey of preferences of screen reader users.