Here’s a nice photo tutorial on making pirate ships and the like.
Creating Data Driven Graphics In Photoshop
This tutorial would be useful for generating large sets of gaming cards.
Star Mats For X Wing Miniatures Game
The X Wing miniatures tend to slide all over table tops, so you definitely need a mat. Here’s a tutorial on making one out of felt.
Street Scenes of London From The 19th Century
A collection of images from 19th century London. Useful for all those steampunk and Victorian gamers out there.
Painting White Tutorial
Here is a very extensive tutorial on painting one of the most difficult colors: white