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Incredible palette maker. 
Move a few sliders, change hue, saturation and value, and voilà~
You won yourself a nice palette of 4/8/16 colors. 

A web-based tool for automatically generating color ramps.  At the time of this posting, it only supports the Dawnbringer 32 palette, but other palettes may be added later.
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The way it works is that you select three colors:
* The color of the object being lit
* A highlight color
* An ambient color (which determines the color of shadows)

You also select the reflectivity of your object.  A perfectly reflective object is like a mirror, and has no color of its own.

As you change the color and reflectivity values, a preview image will be updated on the fly to show you what your gradient will look like when in use.  The gradient will always use colors from the Dawnbringer 32 color palette (other palettes may be added later if people like this tool).  It will avoid duplicate colors and do its best to make sure the gradient is sorted by luminosity.

Anyway, it probably makes more sense if you just mess around with it, so let me know what people think, and if there's anything that would be useful to add to it.

Bart
http://opengameart.org

See the forum thread HERE for details or info.

While designing we need to find good color scheme - set of colors producing the best impression. Experienced designers choose colors intuitively, many people can smell which colors go together well and which don't. However, finding the good combination of colors may be sometimes long and gruelling work. This tool will find set of colors you can start with, and it may facilitate your looking for the optimal color palette.

This application generates color schemes of several types. Every scheme is based on one (base) color, which is supplemented with additional colors making together the best optical imperssion - using one of the authentic algorithms.

ColorPix(freeware) is a useful little color picker that grabs the pixel under your mouse and transforms it into a number of different color formats. You can use the built-in magnifier to zoom in on your screen, click on a color value to copy it directly to the clipboard, and even keep ColorPix on top of all other apps and out of the way.

Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies. THIS is an extension for Mozilla Firefox ONLY! Supports custom colour palettes that can be very useful when looking for the right colour value to fit your pixel work.

Color palettes used in classic paintings.

tutorials galore!

Combining Flash and pixels.

 One of the best tutorials I had ever seen. She has comprehensive guides on Human and Animal Anatomy, Emotion Charts, Color Theory and some unique ones like Arabesque. She's provides really nice references and worth the look.

One manga site. Basic to CG and some tips on gear.

Features a tips and tricks section with a chrome tutorial that was of particular use to me. The full list:

Color
1-1 Grayscale
1-2 Gold
1-3 Color Replacement

Shading
2-1 Sphere
2-2 Cylinder
2-3 Metallic Objects

Composition
3-1 Complicated Objects
3-2 Applying Textures

Transformation
4-1 Selection Tools
4-2 Effect with Option Drag
4-3 Resizing

Mask
5-1 Deep Mask

Take Paint further with this gem.
Ever wondered how to scale, clone and make custom sized brushed?
These tips may help. Chapter 2 is useful for creating doublewide pixelart.

Part 1 of a so-far 3 part color palette creation series of pixel rants

Part 2 of a so-far 3 part color palette creation series of pixel rants

Part 3 of a so-far 3 part color palette creation series of pixel rants

On this web page your going to find a tutorial about rocks and stone textures. Simple and direct.

6 tutorials to get you started.

Jon Purdy (evincarofautumn) & Kevin Chaloux (Kaiseto) of Purloux Studios have made one of the easiest and comprehensible pixelart basics tutorial to be found. It covers all the basics, from lineart, coloring, specific techniques, and opinions on creating pixelart.

"If you are new to pixelart and can ony read one tutorial, this is the one."

At the end of the Anti-Aliasing (AA) section is a link to their comprehensive Anti-Aliasing tutorial which is a must see/read. It is a detailed overview of the theory/process of AA. It is comprehensive enough for beginners who understand nothing or little about AA.

A tut on sub-pixelling with theory, definitions and examples.

Swatchy, is a great tool for swapping palettes between sprites. you could make a set of steel armor sprites for your character and non distructively change them to gold, wood, fire, diamond with easy palette switching tools and an amazing realtime preview function. 

Tutorial for creating an animated wave pattern.