Steve Burt offers a set of free wargames rules for Wild West Skirmishes.
Shadowwolf offers a nice set of paper models of Wild West buildings.
Gene Autrey's serial, The Phantom Empire is available for viewing online. It's a great mix of cowboys and science fiction:
From IMDB:When the ancient continent of Mu sank beneath the ocean, some of its inhabitant survived in caverns beneath the sea. Cowboy singer Gene Autry stumbles upon the civilization, now buried beneath his own Radio Ranch. The Muranians have developed technology and weaponry such as television and ray guns. Their rich supply of radium draws unscrupulous speculators from the surface. The peaceful civilization of the Muranians is corrupted by the greed from above, and it becomes Autry's task to prevent all-out war, ideally without disrupting his regular radio show.
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This tutorial explains how to make a water tower suitable for Wild West games.