• American National Election Studies (ANES)
  
  
• Fragile Families and Child Well Being Study (Princeton)
  
  
• General Social Survey
  A guide to General Social Survey (GSS) Data and Documentation Sources on the Internet
  
  
• Inter-University Consortium for Political and Social Research (ICPSR)
  ICPSR is the closest thing we have to a national data archive, though it contains international data as well. If you are looking for social or political data, it should be your first stop. It also contains some historical and economic data as well.
  If you haven't used ICPSR before, I recommend beginning with the Data Use Tutorial.
  
• Kinsey Institute for Research in Sex, Gender and Reproduction: Data and Codebooks
  
  
• LAPOP: Latin American Public Opinion Project
   Hosted by Vanderbilt University, this is a gateway to "databases of public opinion information about political viewpoints across Latin America."
  
  
• Minority Data Resource Center (MDRC)
  An initative of ICPSR, the "MDRC provides data resources for the comparative analysis of issues affecting racial and ethnic minority populations in the United States."
  
  
• Murray Research Center (Radcliffe College) 
    Emphasis on data related to human development and social change. Many longitudinal studies are available.
  
  
• National Longitudinal Surveys (NLS)
  
  
• Pew Internet and American Life Project Data Sets
    "The Pew Internet & American Life Project will create and fund original, academic-quality research that explores the impact of the Internet on children, families, communities, the work place, schools, health care and civic/political life. The Project aims to be an authoritative source for timely information on the Internet's growth and societal impact, through research that is scrupulously impartial. "
  
  
• Public Opinion Poll Question Database (Odum Institute)
  "The Odum Institute's Public Opinion Poll Database allows any researcher to search for specific poll questions among the more than 230.,000 questions in the Institute's archive by key words, date, study number, study title or state. The system displays the full question text, study information, and frequency distributions..."
  
  

Using Data Responsibly

• Citing Electronic Data Files
  A helpful guide from ICPSR.
  
  
• ICPSR's Confidentiality Procedures
  
  
• Vanderbilt's Institutional Review Board