C. Berger passed along a link to me today from a talk she went to. Check out colorbrewer.org. It looks useful for picking out color schemes for displaying data, or more fun things like presentation templates, webpages, etc.
You input the “number of classes” of data (read, number of colors in your scheme), what type of data you have — sequential, diverging, or qualitative (not sure exactly what these man) — and then choose from one of 9 different color schemes. The colors you’ve selected are displayed on a map so you get an example, and of course, they give you the rgb, cmyk, hex, etc. values of the colors. It also tells you some other important qualities of the color scheme chosen such as whether it is friendly to color blind people or will translate well if printed as black and white (useful for all of us publishing color online and black and white print figures).