Here’s a nice photo tutorial on making fire and smoke effects for your wargames miniatures. The author has done a nice job on this one.
The Krigsspll.dk site offers a very large selection of downloadable flags for the Crusades. They are all very well done.
Osprey is offering its basic rules for the popular Frostgrave miniatures game for free.
Vignette is a simple and flexible RPG from Nathan Russell. He uses it for a wide variety of genres and settings. There are some concepts here to steal for the more RPG based miniatures games.
Who needs Osprey Books? The New York Public Library has a gorgeous set of color plates of the uniforms of the Ancient Roman Army.