Considering that the Stainless Steel Solar Vent (which is a bit oddly named in that it sounds like you're venting sunlight) can run for 48 hours in the dark, even in the winter hours you're looking at a silent, cost-effective ($130 USD and no mains charges after) solution to areas that tend to have condensation or mold problems. Also, obviously, with it being solar powered you don't have to do any wiring. It can also be set on intake, allowing you to circulate fresh air into those dusty computer rooms without sacrificing a precious wall socket. [GT]
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From: BEST OF 2008: Eco-friendy and sustainable shoes