Want to get started fast with SuperMongo (SM)? Here's a commented short script (and data file) that will make two plots (1, 2). The sample plots look pretty terrible, but I wanted to facilitate direct comparison--you'll get much better results if you plot postscript files instead.
Color palettes for plotting. Ever noticed that on the standard red/green/blue plots, the blue doesn't stand out as much? RGB-equal colors don't have a constant luminance to your eye. Here are a few color palettes that do. And here are the equations to make your own.
Also check out the plotting links on the useful links page.