This document discusses how personalization has become the new approach to website optimization, moving beyond traditional A/B testing. It provides several examples of how personalizing content and offers for different visitor types, such as location, past behavior, and campaign source, can improve metrics like click-through rates, subscriptions, and transactions. The key takeaways are that special visitors should receive special treatment, targeting content to individual visitor characteristics can waste less money and drive better results than generic pages, and personalization allows making content more relevant to different audiences.