456 Berea St: 10 colour contrast checking tools to improve the accessibility of your design

http://www.456bereastreet.com/archive/200709/10_colour_contrast_checking_tools_to_improve_the_accessibility_of_your_design/
"At my dayjob we create the graphic design for most of our clients’ sites, but not for all of them. Sometimes the client or the client’s design agency creates the visual design and leaves conversion to HTML + CSS + JavaScript and CMS-ifying to us. When that happens, I almost always find problems with insufficient colour contrast in the design. Sometimes the problems are minor enough to be acceptable, but often there are areas that need to be adjusted."