For your professional development - Organizations:

• American Sociological Association (ASA)
• Association for Humanist Sociology (AHS)
• Association for Qualitative Research (AQR)
• Rural Sociological Society (RSS)
• Society for the Scientific Study of Religion (SSSR)
• Society for the Study of Symbolic Interaction (SSSI)
• Society for the Study of Social Problems (SSSP)
• Sociologists for Women in Society (SWS)
• Sociology of Education Association (SOE)
• Eastern Sociological Society (ESS)
• Southern Sociological Society (SSS)
• Midwest Sociological Society (MSS)
• Pacific Sociological Association (PSA)
• Mid-south Sociological Association (MSA)
• North Central Sociological Association (NCSA)

For your general research:

• Loyola Library Sociology Research Resources - a good place to start
• Sociological Abstracts
• Statistical Abstract of the United States Census Bureau 2012
• Worldometers 
• World Health Organization Health Statistics and Health Information Systems 
• U.S. Department of Justice A to Z Index

For your career search:

• MSWGuide.org
• Online Clinical MSW Degrees
• Association for Research on Nonprofit Organizations and Voluntary Actions (ARNOVA)