Microsoft.com
Accessible Web design is good Web design. Much of the information on the Web is not accessible to people with disabilities because of poor design.

LLRX -- CongressLine: Web Content Accessibility Guidelines: Striving Toward Universal Access
Search LLRX ... of assistive technology, Web Content Accessibility Guidelines and the promulgation of federal regulations ...

Software to check compliance with accessibility guidelines for web usability
Dreamweaver extension that automatically checks code for possible violations of usability guidelines for supporting users with disabilities.

IMS Global Learning Consortium: Accessibility Specification
AccessForAll Meta-data. Accessibility for LIP. Guidelines for Developing Accessible Learning Applications. Accessibility Support Website. Accessibility Brochure. Download Specifications