A discussion on the UIUC Webmasters listserv talking about copyediting style linked to a completely unrelated article entitled Javascript and screen readers which I found to be much more interesting than the style discussion (although the style discussion was interesting, too).  The article traced some accessibility design principles back to the limitations of two popular screenreader programs (Jaws and Window Eyes).  It specifically is in the context of AJAX-enhanced pages and, I believe, serves as a foundation for future articles that will get more specific.