colour_scheme [the libarynth]

http://www.paletton.com/
“Colors for data scientists. Generate and refine palettes of optimally distinct colors” http://tools.medialab.sciences-po.fr/iwanthue/
colour picker using the Munsell color system » http://colorusage.arc.nasa.gov/ColorTool_appletMac.html

“USING COLOR IN INFORMATION DISPLAY GRAPHICS” > http://colorusage.arc.nasa.gov/

http://www.colourlovers.com/blog/2007/09/19/the-7-wonders-of-the-food-coloring-world/

“preview a set of linear interpolated equidistant colors.” http://vis4.net/labs/185
Adobe's interactive, online colour-scheme picker > http://kuler.adobe.com/
“Why Programmers suck at Picking Colors” > http://www.betaversion.org/~stefano/linotype/news/108/