A fantastic colour resource

[toxicvoxel]

Useful for design and digital painting:
http://www.colourlovers.com/
(- Also check out the palette search page.)

[Panga]

Thanks for this...colours are always a difficulty for me !!

[olishea]

cheers, bookmarked!

[numbthumb]

Great find, thanks!

[Alan Fraser]

Very nice...I like the pattern function.
Just to keep things together, here's a similar one from Adobe. http://kuler.adobe.com/#create/fromacolor
Put the concentric circle on the colour you want as a base, then twirl the other nodes around to create harmonies.