Where can I find a useful list of web resources regarding web accessibility?

You can find lists of resources on the World Wide Web. Here are some good places to start:

• UW Accessibility
  Help and tips for creating accessible digital resources, including websites, documents, videos, and more.
• Introduction to Web Accessibility
  Resources include links to mainstream developers' accessibility information, accessibility organizations, and legal, policy, and government sites.
• Guidelines and resources supported by the World Wide Web Consortium and the Making the Web Accessible.
• Section 508
  U.S. government standards and resources on accessible information technology, including websites.