http://www.w3.org/TR/2006/WD-WCAG20-200 ... lines.html
found this lurking in my google home page this morning, any one seen it or got thoughts? Its the working draft of the web accessibility guidelines 2.0.
I like the idea of adding sign language to videos in 1.2.5, there must be a dozen ways you could do that.
WCAG 2.0
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