Adobe's Kuler - http://kuler.adobe.com/
is widely considered to be the best color palette selector out there, as it also lets you share color palettes other users have created. Sign in, click create, and you'll have options including "complementary" that give you a good starting point if you have one color in mind.
http://www.colorschemer.com has an online color scheme gallery.
They also have a free desktop app called ColorPix:
(source: colorschemer.com)
I love colourlovers.com. It's a great community and a great idea, though it doesn't really "spit back" colors as you were looking for. The community that contributes to it provides ample complementary colors though.
I'm a huge fan of Color Scheme Designer...
http://colorschemedesigner.com/
From the Lifehacker article...
You can generate single monochromatic, complimentary, triad, tetrad, analogic, and accented analogic color palettes. You can simulate color-based vision disorders to see how your design colors will look—they even list the percentage of people suffering from the disorders. A preview function populates a dummy web page with your color scheme, which is a handy tool for seeing how your selected colors look together off the palette.
While the page-simulator is a really great trick, the best feature of Color Scheme Designer is the ability to export your palette not just as a Photoshop palette—a common limitation of many web-based generators—but as HTML+CSS, XML, TXT, and GPL (the palette format for GIMP).
My favorite: http://www.colorsontheweb.com/colorwheel.asp
http://www.visibone.com/colorlab/
http://www.wellstyled.com/tools/colorscheme2/index-en.html
http://www.allprofitallfree.com/color-wheel2.html
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