All but one of the five papers in the present volume of Theoria deal with aspects of one of the central thematic concerns of contemporary political theory: the deliberative and participatory arrangements optimal for democratic flourishing. The first three essays are critical responses to Cass Sunstein’s treatment of democracy and deliberation in his timely and important book, Infotopia: How Many Minds Produce Knowledge (2006). Infotopia enquires as to how, in the information age, we may arrive at the best, most accurate information. Sunstein assesses arrangements by which dispersed information is pooled in order to improve collective decision-making. He evaluates competing methods for aggregating information, including surveys, deliberation, markets, blogs, open source software and wikis.