A client sent a link to ColorBrewer, a web tool to help choose optimized color schemes for thematic maps:

http://www.personal.psu.edu/cab38/ColorBrewer/ColorBrewer.html

For each of the mini legends shown at Step 3, you are able to get not only the color specs, but also whether the color palette is friendly for color blindness, projectors, photocopiers, laptops, CRT screens, and printing.