"Boom!" orchestrates a baby-boom epiphany. It stages a virtual reunion of America's Class of 1968, accompanied by a full spectrum of opinions about the impact of that pivotal year. Although he describes his role in this process as that of moderator and class president, there's more to it than that. Mr. Brokaw serves as a latter-day Rip Van Winkle, awakening to marvel at four decades' worth of changes in the book's dozens of interviewees. He also takes on the perilous job of wondering what it all means.