On a train ride up the coast this weekend I had a read through a working draft of the WAI ARIA roadmap (Web Accessibility Initiative Accessible Rich Internet Applications).
New technologies often introduce new accessibility problems. The WAI ARIA goes a long way to describing in particular the accessibility problems introduced when you are using JavaScript to generate dynamic content and controls.
For a general understanding of how JavaScript affects assistive technologies I found this diagram very helpful:
http://www.w3.org/TR/wai-aria-roadmap/#fig2
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