Senator Edward Kennedy is breaking new ground with a completely redesigned web site that meets the requirements of The Rehabilitation Act Amendments (Section 508). For more information on how federal agency sites must provide web site access and associated online services for individuals with disabilities, refer to this site, Section 508: The Road to Accessibility, from FirstGov.
This recent, well annotated article clearly explains the use of HTML coding techniques that facilitate web site accessibility according to Sec. 508 requirements.