Test Your Site
If you would like to see just how accessible your site is, why not test a page for conformance to either Section 508 or WCAG Priorities 1 through 3, using the Cynthia Says online accessibility parser.
You can find more information about Cynthia Says at http://www.cynthiasays.com/cynthia/cynthia.htm.
Before testing your site, ensure that you read the article Automated testing - How useful is it?