The University of Wisconsin Data and Program Library Service, which has been providing machine-readable social science data to university researchers for over 30 years, has recently made this data repository available to everyone. At present the site contains 12 studies, including US riot and civil disorder data from 1961-1968, slave movement during the 18th and 19th centuries, the Russian and French Bureaucracies of the 18th & 19th and 17th & 18th centuries respectively, and the Catasto Study, a census and property survey in Florentine Domains and Verona Italy in the 15th century. Each study contains a description, data codebooks and documentation, citation instructions, and, after free registration, the data (UNIX tar.z or DOS self-extracting .exe files) from the study. As this site grows, it will become a major source of primary social science data.