LONDON -- "It's very dark. It's almost black." May Woodward, an office worker in central London, is holding an Oreo cookie in her hands. It's the first time she has ever seen one "in the flesh as opposed to on an American TV show," and she's not sure she likes what she sees. "It's the color of wet mud!" she complains. "And the bit ... looks like toothpaste rather than cream." She twists and turns the cookie in her fingers, staring at it from every angle with a screwed-up look on her face that seems to say, "Gross!" not "Mmm,...