The Comparative Study of Electoral Systems (CSES) is a cross-national research program conducted in about 50 countries and focusing on the impact of elections on citizens and democracy. The website provides datasets consisting of post-election surveys ranging from macro-variables to district-level data and individual attitudes. Two modules of data collection are available (1996-2001 and 2001-2005). Through a free email subscription, users have access to detailed reports and surveys, research design as well as administered questionnaires in full-text format. For reading and using the entire dataset release, however, statistical softwares (SPSS, SAS or STATA) are necessary. Some short results and data elaboration (graphics and tables) are also provided with rich metadata info as well as detailed methodological explanantions on how to use the datasets and contribute to the data collection. A mirror site is hosted by GESIS (Germany). A fair amount of working papers, conference proceedings, journal articles and CSES presentations and planning reports are also provided. The sections dedicated to books, book chapters, dissertations are at an early stage: only few records are present, yet always with references and metainfo. The homepage of this clearly organized and easy-to-navigate website is available also in Spanish.