No nonsense tool to convert color codes.
color theory magnets – Simple Memory Art
Get your RGB/CMYK on early.
Color Inspiration from the Masters of Painting
From the greats using colors like “blood of the passionfruit seed orange” come hex numbers like #FF0000. But of course, if you’re reading this at my blog, you’re looking at a color palette based on a shade of blue in a Klee painting.
Get the Look – Adam Polselli
Nice series of articles on designing with colors, for looks varying from Corporate to Vintage.
Color Palette Generator
Send this thing a link to an image, and it spits out a useful hex color palette.
ColorJack: Studio (beta)
Sweet css color comparison tool.
Color Codes Matching Chart HTML (Pantone, CMYK, RGB Hex)
Useful color chart with hex codes.
Colors.cgi 1.01 by Caspian
HTML color picker.
colr.org
html/css color picker with schemes