On 15th May 2001, the Hon Justice Sandra Day O'Connor delivered the inaugural Sir David Williams Lecture entitled "Altered States: Federalism and Devolution at the 'Real' Turn of the Millennium". The Sir David Williams Lecture is an annual address delivered by a guest lecturer in honour of Sir David Williams, Emeritus Rouse Ball Professor of English Law and Emeritus Vice-Chancellor of Cambridge University. More information about this lecture, including a transcript, is available from the Centre for Public Law website at http://www.cpl.law.cam.ac.uk/sir_david_williams_lectures/