The Miniature Wargaming Editor The War Games Table blog has some very creative ideas for tactical markers for Chain of Command. They are, for the most part, scenery bits that look very much a part of the table.
Similar markers could be used for other games, obviously. The appeal of these is that they convey information, while still making the table look good.
Gemini is a set of alternate skirmish rules for Warhammer 40K that use an Activation Roll, Action Point system.
There seem to be quite a few people who love the Warhammer 40K Universe, but who are less than enamored with the rules.
Mesopotamia Birth of Civilization is a free, downloadable board game by Garry Stevens designed to teach the history of the Fertile Crescent. Garry writes:
Mesopotamia follows the rise and fall of twenty nations from the Sumerians to the Persians over two thousand years of history. It purloins freely from those wonderful classic games Civilisation, History of the World, and Ancient Conquests, to which I owe a huge debt. The game is more historical than Civilisation, but less world-encompassing than History of the World (HOTW). The basic system is that of History of the World, but with one very significant difference.