Windmills for Wi-Fi

From Wi-Fi Net News: "A University of Texas professor creates tiny windmills to tilt at providing electricity: The prof has developed a system with his group that uses piezoelectric crystals which, when flexed by the small pressures provided by a 10-centimeter windmill running as slow as 17 miles per hour, can produce 7.5 milliwatts of electricity. This could be enough to power wireless sensors." Link