What do age ethnicity and lifestyle have to do with personal computer choices? Quite a bit if you watched Apples advertising for the past several years. You probably know the ads well: Two white men in front of a white screenstereotypes of the computer manufacturers users and their corporate culture. The Mac guy is young good-looking smart and very cool. Then theres PC who is chunkier a little dopey and dressed in a very uncool business suit. The series of ads currently over 50 of them have been wildly successful and have helped to advance Apple to double-digit market share in the home personal computer market.