Aron Ralston, who amputated his own arm after being trapped by a boulder in Utah backcountry, still struggles with the meaning of his survival. "It was a blessing in a way," 33-year-old Ralston, of Boulder, tells The New York Times."It made me think about the way I was living." Ralston, whose account, "Between a Rock and a Hard Place" hit No. 3 on the Times' best-seller list, found celebrity in the world of adventure sports and motivational speaking and has become "more serious now, and by that I mean not somber but intense," his younger sister says