Rowan Williams, Archbishop of Canterbury, yesterday gave an important speech in Rome at a symposium sponsored by the Pontifical Council for Promoting Christian Unity. It is devoted to the doctrine of the Church (ecclesiology), focuses on three main questions (authority, primacy, the relation between the universal and the local), and wonders whether disagreements with regard to them remain serious enough to undo important convergences with regard to the theological understanding of the Church. You can find the talk here. And here you can watch and listen to him give part of the speech.