When developing web sites, making them as accessible as possible is crucial, both to people with different kinds of disabilities as well as to all kinds of different devices, web browsers and screen readers etc.
Why? Out of respect for the user, while making the web site available to as many users as possible.
Edward Clarke has written two things that I liked: Why your business benefits from adhering to the web standards and the Why WAI-AAA and W3 code validation don’t equal accessibility post at webdeveloper.com.
Things the web content developer must satisfy. Fulfilling this leads to the Conformance Level “A”.
Things the web content developer should satisfy. Fulfilling this leads to the Conformance Level “AA”.
Things the web content developer may address. Fulfilling this leads to the Conformance Level “AAA”.
There are certain checkpoints for helping you know what to live up to. There are also HTML Techniques, CSS Techniques and information about the accessibility features of CSS available at the W3C web site, as well as information about the accessibility improvements in HTML 4.
There are also links and information about alternate web browsers there.
Amongst others, Joe Clark thinks the WCAG 1.0 guidelines have too little bearing in the real world, and he is eager to get people involved in the WCAG 2.0 guidelines in his How to Save Web Accessibility from Itself.
Matt May has written a short and concise piece about Accessibility From The Ground Up.
Eager to test you code now? You can check color contrasts with this tool that Roger gave me a tip about, there’s a colorblind filter service available, but most of all I recommend the excellent tool for checking accessibility: Bobby.