The Hometheaterhifi website recently posted an AC cable comparison. Some generic AC cables were tested along with some Nordost Valhalla power cords. Unlike other product reviews, this one actually used a blind panel and DBT to test for any observable differences in sound quality. And the conclusion of this review was what one would expect -- nonconclusive!

http://www.hometheaterhifi.com/volum...s-12-2004.html