Accessibility to the Face is a must read article for any web site owner, designer, or developer, etc., especially for those who doubt the importance of creating an accessible web site. It’s a personal perspective by Rob Foster. The article doesn’t mention web accessibility specifically, but is directly related (well, he does mention Section 508).
Here’s a quote about the goal of the article:
My hope with this article is to make accessibility issues surrounding disabilities become real for the reader. The ideal response for me would be for people to think a little harder about the people using your product or experience and what it might be like for those who may not have all their faculties.