Screen Readers, css, and Javascript (AJAX)
How ajax can work with screen readers: http://juicystudio.com/article/making-ajax-work-with-screen-readers.php
Roles for Accessible Rich Internet Applications: http://www.w3.org/TR/2006/WD-aria-role-20060921/
Section 508 Accessibility Checklist for HTML: http://www.webaim.org/standards/508/checklist
Section 508: http://www.section508.gov/
Screen Readers
JAWS: http://www.freedomscientific.com/fs_products/software_jaws.asp
Supernova: http://www.dolphincomputeraccess.com/products/supernova.htm
Windows-Eyes: http://www.gwmicro.com/Window-Eyes/
Fangs (Firefox screen reader emulator): http://www.standards-schmandards.com/index.php?show/fangs