These are notes from a class titled The State of Drupal Accessibility I attended during AccessU 2010.

Accessibility Modules

• Accessible Helper - API for modules & fixes few common accessibility issues
• Text Size - Allows user to change text size on fly
• Page Style - Adds high contrast options
• Switchtheme - Allows user to switch theme on fly
• Accessible Content - Builds tests against site, creates additional validation
• Page Title - Gives more control over the title in browser
• Read More Link - Moves 'read more' link from links area to end of content & allows customizing the text

Look into

• ARIA guidelines
• ATAG guidelines
• Eleven Most Accessible Drupal 6 Themes
• D theme for da Web

Found two more good links on d.o

• Issues tagged with Accessibility
• Accessibility group