AJAX and Screenreaders: When Can it Work?
http://www.sitepoint.com/article/ajax-screenreaders-work

Edwards, James
SitePoint
2006

Abstract:

We've all heard a great deal of buzz about AJAX in the last few months, and with this talk has come a legion of articles, tips, presentations and practical APIs designed to explore the possibilities and try to arrive at best-practice techniques. But, for all of the excitement and hype, still very little has been said on the subject of AJAX and accessibility.