Hard Surface Texture Painting Workflow
http://www.game-artist.net/forums/spotlight-articles/42-tutorial-hard-surface-texture-painting.html
Ok, so technically this isn't a tutorial as such but it presents some great techniques and rules for painting hard surface textures. There's a few great tricks for really making photoshop painted textures come alive, but at the same time if you're new to texture painting/UVW mapping you might want to find something more basic and then come back to this. Regardless, this is a great reference for reminding yourself of the basic rules for effective hard surface textures. 8/10