Color Resources

Color Palette Generator: Creates a color palette from an image.
Color Blender: Creates intermediate colors between 2 colors
Color Schemer: Enter a color in RGB or Hex - then generate a color scheme
I Like Your Colors: Gets the hues from a web page
Photographic Palettes: Create a color palette from an image
Color Lovers: Color Trends + Palettes: User-contributed color palettes
Color Wizard: Cool tool for creating colors - enter Hex digits or select with the RGB sliders, then see hue, saturation, and tint & shade variations. Select different color relationships such as triadic, complementary, etc.
Color Hunter: Create and find color palettes made from images

Web Colors: HTML colors, names, and Hex values
500+ Named Colors with RGB and Hex Values: Really over 500 colors. Not all the names are web names, however.

Color Theory for Web Designers: Theory, combinations, web colors
Color Meanings and Colors That Go Together: Color meanings and other color theory info

Color Contrast Checker: Test contrast between two colors to see if they are distinguishable by someone with color problems or viewing the site on a B&W monitor
Accessbility Color Wheel: Cool tool - select two colors and check them for the 3 common kinds of color blindness
Color Blindness Simulator: Will show you how your images appear to someone with the 3 common kinds of color blindness