Web resources:

JSTOR - Electronic Journal Storage

MathSciNet

Statlib Index (Carnegie-Mellon U.)

Virtual Library of Statistics (U. Florida)

The World of Statistics (UCLA)

Professional Societies:

American Association for the Advancement of Science (AAAS)

American Mathematical Society (AMS, e-MATH)

American Public Health Association (APHA)

American Society for Quality Control (ASQC)

American Statistical Association (ASA)

Biometric Society (ENAR)

Classification Society of North America (CSNA)

Institute of Mathematical Statistics (IMS)

Institute of Electrical and Electronics Engineers (IEEE)

International Statistical Institute (ISI)

The National Academies (NAS, NAE, NRC)

Population Association of America (PAA)

Royal Statistical Society (RSS)

Society for Industrial and Applied Mathematics (SIAM)

Government Organizations:

Bureau of Labor Statistics (BLS)

Department of Health and Human Services (HHS)

National Institute of Standards and Technology (NIST)

National Science Foundation (NSF)

National Security Agency (NSA)

U.S. Army Corps of Engineers (USACERL)

U.S. Census Bureau

U.S. Department of Agriculture

U.S. Environmental Protection Agency (USEPA)

U.S. Food and Drug Administration (FDA)

Nonprofit Organizations:

Educational Testing Service (ETS)

National Center for Genome Resources (NCGR)

National Institute of Statistical Sciences (NISS)

RAND

Research Triangle Institute (RTI)

Software:

Cytel Software Corp. (StatXact, LogXact)

MathSoft, Inc. (S-Plus)

Minitab, Inc. (Minitab)

SAS Institute (SAS)

SPSS, Inc. (SPSS, SYSTAT)

Stata Corporation (Stata)

Research Triangle Institute (SUDAAN)

Wolfram Research (Mathematica)

University of Minnesota (XLISP-STAT)