Ah, the sweet memories of Christmas . Gifts under the tree. Cookies for Santa. And, of course, the annual fruitcake. For young David Valdes Greenwood, the indomitable "little fruitcake" at the center of these tales, nothing is sweeter than the promise of the holidays. A modern-day Tiny Tim, he holds fast to his ideal of what Christmas should be , despite the huge odds against him: Sub-zero Maine winters. A host of eccentric relatives. And his constant...