During the past decade, rapid developments in information and communications technology have transformed key social, commercial and political realities. Within that same time period, working at something less than internet speed, much of the academic and policy debates arising from these new and emerging technologies have been fragmented. There have been few examples of interdisciplinary dialogue about the potential for anonymity and privacy in a networked society. Lessons from the Identity Trail fills that gap, and examines key questions about anonymity, privacy and identity in an environment that increasingly automates the collection of personal information and uses surveillance to reduce corporate and security risks. This project has been informed by the results of a multi-million dollar research project that has brought together a distinguished array of philosophers, ethicists, feminists, cognitive scientists, lawyers, cryptographers, engineers, policy analysts, government policy makers and privacy experts. Working collaboratively over a four-year period and participating in an iterative process designed to maximize the potential for interdisciplinary discussion and feedback through a series of workshops and peer review, the authors have integrated crucial public policy themes with the most recent research outcomes.