Aaron Cannon, a blind web developer and accessibility consultant, has shared a great web accessibility checklist that every designer & developer will find handy.

It includes more user experience facts than the technical ones. Just like:

  • Avoid CAPTCHAs unless you have no other choice, and even then
    they should be avoided. However, if you must use them, provide
    an audio CAPTCHA alternative.
  • Provide “Skip to content” links at the top of the markup order in
    pages with large numbers of navigational links before the main
    content.

The list can be reached as PDF and text formats.