Introduction : Federalism's Janus face / Elke Cloots, Geert De Baere and Stefan Sottiaux -- EU federalism in 3-D / Koen Lenaerts -- Federalism and jurisdiction / Pavlos Eleftheriadis -- Federalism, the EU and international law : on the possible (and necessary) role of subsidiarity in legitimate multilevel trade governance / Alexia Herwig -- The Court of Justice as a federal constitutional court : a comparative perspective / Monica Claes and Maartje de Visser -- The dual system of rights protection in the European Union in light of US federalism / Aida Torres Pérez -- Federalism and international relations in the European Union and the United States : a comparative outlook / Geert De Baere and Kathleen Gutman -- European ties that bind : political or cultural? / Helder De Schutter -- Does EU decision-making take into account regional interests? / Piet Van Nuffel -- The role of sub-state entities in the EU decision-making processes : a comparative constitutional law approach / Nikos Skoutaris -- Autonomous constitutional regions in a federal Europe / Joxerramon Bengoetxea -- The European Court of Justice and the devolution of taxation powers / Suzanne Kingston -- The impact of EU law on the devolution of social powers in the member states / Herwig Verschueren -- EU law and language regulation in (quasi-) federal member states / Elke Cloots and Stefan Sottiaux -- The European Court of Justice and member state federalism : balancing or categorisation? / Elke Cloots -- The impact of "regional blindness" on the Italian regional state / Giuseppe Martinico -- The Spanish state structure and EU law : the view of the Spanish consitutional court / Maite Zelaia Garagarza -- Economic and monetary union : caught between Brussels and Luxembourg? The influence of EU law on Belgian federalism case law / Stef Feyen.