When Mary Aehlich gave up her career as a weapons controller in an Air Force AWACS spy plane to become casino administrator at The Venetian resort in Las Vegas, she joked that she went from "combat boots and flight suits to sequins and high heels." But now the stay-at-home mom of two babies is again on the front lines, of sorts. As an occasional at-home Web site tester, she's part of an early warning system for e-tailers—helping them figure out what works and what doesn't in the uncharted world of Web commerce.
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