For your professional development - Organizations:

• American Sociological Association (ASA)
• Association for Humanist Sociology (AHS)
• Association for Qualitative Research (AQR)
• Association for Research on Nonprofit Organizations and Voluntary Actions (ARNOVA)
• Rural Sociological Society (RSS)
• Society for the Scientific Study of Religion (SSSR)
• Society for the Study of Social Interaction (SSSI)
• Society for the Study of Social Problems (SSSP)
• Sociologists for Women in Society (SWS)
• Sociology of Education Association (SOE)

For your general research:

• Sociological Abstracts 
• Social Science Citation Index 
• Statistical Abstract of the United States Census Bureau 2010 
• Fedstats.Gov 
• Worldometers 
• World Health Organization Health Statistics and Health Information Systems 
• Historical Research and Content Analysis: For the purpose of historical research or content analysis, this is a whopping list of archival material available online (general collections, film, television, radio, political messages and literature).
• U.S. Department of Justice A to Z Index