Pew Research Center
"The Pew Research Center is a nonpartisan "fact tank" that provides information on the issues, attitudes and trends shaping America and the world. It does so by conducting public opinion polling and social science research; by reporting news and analyzing news coverage; and by holding forums and briefings. It does not take positions on policy issues."

Pew Research Center : Datasets
Allows download of public surveys conducted on politics, religion, demographics, housing, relationships, work and many other topics.

ICPSR (Inter-University Consortium for Political and Social Research, Institute for Social Research, University of Michigan)  Access Instructions
Provides access to archived social science data and data-driven learning guides designed for the classroom. Includes information about data management and curation services available to member institutions. See Qualitative Data Repository for qualitative and multi-method data.

Statistical Insight (ProQuest)  Tutorial
Offers indexing, abstracting, and selected full text of statistical publications from U.S. state and federal governments, business and research institutes, and international material from the UN, OECD, EU, etc. Some tables are available in GIF, XLS, CSV, and other formats.

Qualitative Data Repository (Center for Qualitative and Multi-Method Inquiry at Syracuse University)  Access Instructions
Archives and publishes data generated through qualitative and multi-method research methods. Provides guidance for managing, sharing, citing, and reusing qualitative data. Villanova's QDR membership offers a range of user support services to facilitate the storing and sharing of data. See ICPSR for quantitative data.