Lately my most favorite webapp has been this tool created by Adobe that really helps to build an idea of what colors I want to work with.
Starting with a base color then it will produce analogous, monochromatic, triadic, complementary, compound or custom color palettes. From there I can go ahead and share my creation or download and import it into Photoshop or Illustrator. Pretty handy.
Even more so you can pursue the huge collection from the community which leads to endless inspiration.
Here’s my favorite color scheme yet Mustang 1944 http://kuler.adobe.com/#themeID/143922
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