The Paint Machine Blog has an excellent, multipart tutorial on painting ancient spanish scutarri. A nice touch is that he tells you how long it takes to paint each step.
Studio McVey has a short tutorial on painting camouflage patterns on a pair of pants.
The Tabletop Terrain Blog has a nice post on using a dip to speed up the painting of Genestealers for Space Hulk.
The Tabletop Terrain blog has an illustrated article on using commercial wood staining projects to finish a basic paint job on a Warhammer Orc. More generally known as The Dip, this method actually involves dipping the figure in the wood stain, or painting the stain on. The dark stain settles into the crevices of the figures, making it look like you spent a lot of time shading them. It generally doesn’t hold up to close scrutiny, but from a distance, in massed troops, looks good. For more, see the Miniature Wargaming Wiki entry on The Dip.
I like to mix my own figure washes in various colors using Future Floor Wax, water and acrylic hobby paints. It’s an integral part of my painting system. I typically waste too much of both floor wax and paint, however, because I inevitably mix much more than I need. It’s occurred to me that the thing to do is to mix a standard set of colors and store them in small bottles. But I never have because I could never figure out where to get the bottles.
Then I ran across a site called Specialty Bottle. They carry bottles in a wonderful variety of sizes, in glass, plastic, and tin. I think I’m going to get a bunch of smallish ones with eye droppers.