As the latest waves of digital change surge in all directions through the advertising and marketing business, managers are confronted with as many opportunities as maddening puzzles. What does it all mean and where is it all going? In its new online version of "Tools of the Trade for the Advertising Industry 2001," AdAge.com presents a comprehensive overview. Learn about the newest digital methods for measuring audiences or gathering demographic data. Get an update on how close video is to eclipsing film or how other digital tools are dramatically altering the fundamental limitations of the creative process. Read it now at http://AdAge.com.