http://www.leveltendesign.com/blog/chris/drupal-section-508-compliance

I received an interesting sales call this morning from a gentleman whose company offers the service of helping to make your website, or client’s websites, Section 508 compliant. After the call I really got to thinking about our clients and how arduous the task is of having a completely compliant website. Don’t get me wrong; I’m not saying that it isn’t important, Target found out the hard way; all I’m saying is that if done properly it’s most likely won't be easy.