For a generation of teenage girls, Sassy magazine was nothing short of revolutionary--so much so that its audience, which stretched from tweens to twentysomething women, remains obsessed with it to this day and back issues are sold for hefty sums on the Internet. For its brief but brilliant run from 1988 to 1994, Sassy was the arbiter of all that was hip and cool, inspiring a dogged devotion from its readers while almost single-handedly...