Try the W3C as a good starting point:
http://www.w3.org/TR/WAI-WEBCONTENT/
http://www.w3.org/TR/WCAG10/
http://www.w3.org/TR/WCAG10/full-checklist.html
http://www.w3.org/TR/WCAG10-TECHS/
And possibly --as 2.0 is in its final stages--:
<http://www.w3.org/TR/WCAG20/>
This second version of WCAG is set up in a somewhat different way than WCAG1.0 so it may be of interest to learn about them before it actually becomes a W3C recommendation.
Jeroen
-- vizi fotografie & grafisch ontwerp - http://www.vizi.nl/
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