Jeff Jonas has an article on using war machines in Warhammer Ancient Battles. There are some nice pictures of painted Roman war machine models, and a good discussion of their use by the legions.
Renaissance Ink has had “flocking gels” for sale for several years, but I was never sure what they were, or what to do with them. This site has a tutorial on how to use the stuff. Looking closely at the photos, I think I can safely say that flocking gels are textured gesso, of the type that you find in the ladies craft stores, such as Michael’s. I’ve use the gritty gesso to texture the sides of my foamcore houses, and the fibrous type to make thatched roofs.
Fred Diamond has a simple set of free wargames rules for playing the Indian Wars in the America of the late 19th century.
Ryan Scow has an article on making balsa strips look like realistic timbers.
I’m currently painting some of Wargames Foundry’s Plains Indians for a 7th Cavalry game. I found this site, with descriptions of symbols that the Native American warriors painted on their horses.