For Better of for Worse: Dynamic Logics of Preference Johan van Benthem Abstract: In the last few years, preference logic and in particular, the dynamic logic of preference change, has suddenly become a live topic in my Amsterdam and Stanford environments. At the request of the editors Sven Ove Hanson and Till Gruene-Yanof of the new book "Preference Change" (Springer Theory and Decision Library), this article explains how this interest came about, and what is happening. I mainly present a story around some recent disser- tations and supporting papers on dynamic logics of preference change and preference merge, as well as some other aspects of rational agency and decision, linking logic, philosophy, game theory, computer science, and optimality theory in linguistics.