A simple test to see if your site passes:
http://www.cast.org/bobby/
The W3C Web Content Authoring Guidelines are the gold standard for accessible
practices:
http://www.w3.org/TR/WAI-WEBCONTENT
There is also a semi-official training curriculum at:
http://www.starlingweb.com/wai/wcag/
IBM also has published design standards (the whole project covers Web design and
software design on several platforms):
http://www.ibm.com/able/guidelines/web/accessweb.html
An overview of other accessibility resources at:
http://www.dcp.ucla.edu/resources/accessibility.htm
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