Designing Accessible Web Sites
The Web Accessibility Initiative (WAI) develops strategies, guidelines, and resources to help make the Web accessible to people with disabilities.
These guidelines explain how to make Web content accessible to people with disabilities. The guidelines are intended for all Web content developers (page authors and site designers) and for developers of authoring tools. The primary goal of these guidelines is to promote accessibility. However, following them will also make Web content more available to all users, whatever user agent they are using (e.g., desktop browser, voice browser, mobile phone, automobile-based personal computer, etc.) or constraints they may be operating under (e.g., noisy surroundings, under- or over-illuminated rooms, in a hands-free environment, etc.). Following these guidelines will also help people find information on the Web more quickly. These guidelines do not discourage content developers from using images, and video, etc., but rather explain how to make multimedia content more accessible to a wide audience.
Download a demo version of the Jaws screenreader (Jaws is widely used). Try out your pages to see how they work. This will give you an idea how people might navigate your pages using the keyboard and help guide the order and layout of text and links on the page.
Check out EASI who run regular listserv workshops on accessible design.
All of the information for all of the people all of the time.