ColorJack Sphere provides an easy way to create color palettes.
You simply select the type of color scheme you’re looking to create (i.e. Six-Tone, Complementary or Triadic) and move the little dots in the color wheel to get the color palette of your liking. You can select a level of color blindness and set the color spectrum (websafe, websmart). You can even export the palettes to Illustrator or Photoshop.
If you’re looking for more control over the palettes, check out ColorJack Studio (screenshot).
A minuratuarized version of Sphere, ColorJack Sphere Widget is available for all major operating systems.
There’s also a little DHTML color picker available for download so you can use it in your own website/application.
Visit ColorJack to check out all of these tools.