Despite a cold spring and late rains, the 2005 Napa Valley grape harvest for sparkling wine began on schedule Wednesday. Under a foggy pre-dawn sky, a crew of 30 whipped through an Oak Knoll vineyard, picking 20 tons of pinot noir for Mumm Napa. Winemaker Ludovic Dervin is pleased with grape quality and flavors, wishing only that quantity had lived up to early predictions. "The chardonnay is right on target but the pinot noir crop is lighter than we'd like," he told the cellar crew and other winery employees gathered for a traditional blessing of the grapes at the Rutherford...