I felt this had to be shared. If you’re any sort of Photoshop user that searches online for color palettes, then your life will be enlightened. Much, much love to whoever discovered this!
In at least Photoshop, Illustrator and InDesign CS5 (maybe other programs/versions too), if you go to Window > Extensions > Kuler, you get a palette with preset color palettes that compliment each other, as well as a tool to help you make new ones. Then you can save it to the Kuler list, or to your Swatches palette.