Just to add to the discussion of jQuery - the core library is pretty good vis-Ã -vis ARIA enhancement, and AOL recently contracted with TPG (http://www.paciellogroup.com/blog/?p=566) to review and improve jQuery UI to fill in any missing holes. This will be a huge accessibility boost to jQuery. Adding third-party modules/plug-in scripts to jQuery might require an assessment to see if the developer added ARIA attributes, but I am feeling very confident that the base library will be extremely good in short order.
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