Google search czarina Marissa Mayer explains her "personal style philosophy" — or, at least, that of her personal shopper and the staff at Bergdorf's — in a comprehensive if hardly hard-hitting followup to the launch of iGoogle's designer themes in the Wall Street Journal. Yes, the woman who showed up to her first interview in a sweater from Macy's INC International Concepts line is being crowned as a new tastemaker. Even as the economy takes a nosedive, Mayer jokes about being an unrepentant label chaser: