Every web designer hears the need to make website accessible to those with disabilities, but it can be a daunting task and it is often difficult to know where to begin. What does that mean? Is the site you designed web-accessible?
I know when I hear someone mention web accessibility, the first thing they mention is usually the need to be award of color blindness and not put red text on a blue background. But is that really it? Actually, no. More important is the contrast between the text and the background. There are free tools that can check colors for enough contrast.
One is at WebAim http://webaim.org/resources/contrastchecker/
Another is Colors on the Web: http://www.colorsontheweb.com/colorcontrast.asp
A great reference to get started on checking your website for accessibility see the Easy Checks – A First Review of Web Accessibility link on the W2C site.