The Leadhead has a very nice article on getting started in airbrushing. Well worth the read.
Carmen’s Fun Painty Time Blog has a nice series of articles on painting a figure in black and white — that is, painting a pulp figure so that it looks like it’s in a classic black-and-white movie. The effect is startling. You need to scroll down to see the entire series in sequence.
Gnome Stew has some useful tips for painting your RPG and board game miniatures.
Dave Taylor miniatures has a photo tutorial on painting highlander kilts. Absolutely beautiful stuff.
The LeadHead blog has a short article on his experiences in stripping paint from figures with Simple Green.