Web Accessibility

The accessibility movement encourages web sites to be built to allow people with disabilities to view them. For example, one accessibility standard is that all images have "alternate text" and "long descriptions" coded into the HTML. This would be useful for software that reads web pages out loud for blind people. Even if they cannot see your images, the software can read the description of the image out loud.

There are two different guidelines often used when determining whether a site is "accessible": the US Government Section 508 Guidelines and the Web Content Accessibility Guidelines.

A book by Robert Yonaitis Understanding Accessibility: Achieving Compliance on Web Sites and Intranets is a valuable resource. 

Accessible Web Design

Accessible Forms

Best Practices for Accessible Flash Design

EASI (Equal Access to Software and Information)

WebAim

How to Make Accessible Web Content Using Microsoft Expression Web - Webaim
 

Web Accessibility Design Sites and Tools

Trace Center - Designing More Usable Web Sites

Commonwealth of Massachusetts, IT Division, Web Accessibility Standards