Two quick items of note to help design for people with color-blindess. One is an accessibility color wheel that helps define and select accessible groups of colors. It uses the WCAG 2.0 algorithm to determine brightness and contrast ratios.
The second is a set of proofing filters for Adobe’s Photoshop CS4 product to test for Protanopia (red) and Deuteranopia (green) deficiencies. It operates in RGB color mode and appears to be a nice way to test graphics for inclusive color application.
This article is written by Daniel Flück for the blog ColBlinder. Further reading uncovers a mention of Coblis, a color-blind image simulator, as well as a list of other simulation tools for color-blindness.