The NASA Socioeconomic Data and Applications Center (SEDAC) operated by CIESIN is a unique source of interdisciplinary data and related information and services related to the human dimensions of global environmental change. To help users more effectively find, access, and use these resources, SEDAC has redesigned its Web site with enhanced search tools, interactive mapping tools, a map gallery, topical views of SEDAC content, and examples of uses of SEDAC data in research, applications, and education. The new site builds on the latest Internet technologies, including a content management system, Flickr, open source Web mapping services, and social networking tools. During the user testing period, users are encouraged to provide feedback on the site’s organization and ease of use and suggestions about new features and content. Comments may be submitted anonymously through a tool available on the lower right corner of each Web page. To visit the site and offer feedback, go to http://beta.sedac.ciesin.columbia.edu:8080/.