The US Dept. of Justice's resource page for the ADA. Voluminous, and not limited to computer and Internet issues, but at least it should be fairly authoritative, if you're willing to wade through the material.

Information, training, resources, guidelines and standards for Web accessibility and disability access to the Web.

Tools, links and resources on Website accessibility.

Encyclopedia article about the topic, including discussion of benefits, technology, guidelines, and legal provisions.

Information about Microsoft accessibility products and services.

Resource for universal interface design and accessibility that provides techniques to support developing and implementing strategies.

Disability simulator software that helps Web designers ensure that their pages are accessible and usable by the visually impaired. (IBM ID required to download.)

A free online resource centre to help designers and managers create accessible web sites. Also links to consultancy services.

Personal weblog with views on accessibility issues, news, and accessibility events.

Accessibility information and Weblogs from the writer Joe Clark