Securely back on its feet with the success of the iPod, iMac, and iLife software suite, Apple has once again taken aim at Redmond with its “Mac vs. PC” campaign, which has challenged the way consumers identify themselves. Two years ago, Apple launched the first in this series of television advertisements featuring comedian John Hodgman as a stodgy PC user and actor Justin Long as the hip Apple enthusiast. The ads targeted a younger, cooler audience -- but risked coming off as snarky. But with each successive quarter boasting record sales for Apple, the gamble looks to have paid off.