Two sites offer a broad range of standards information, as well as links to other standards sites around the world:
NSSN - A National Resource for Global Standards
World Standards Services Network

National and international standards bodies
American National Standards Institute
International Organization for Standardization (ISO)
CEN - European Committee for Standardization
Standards Council of Canada
Dirección General de Normas (Mexico)
British Standards Institution (BSI)

Standards developing organizations
Acoustical Society of America 
American Industrial Hygiene Association
American Society of Safety Engineers
American Welding Society
ASTM International
Canadian Standards Association (CSA)
National Fire Protection Association

Third-party certification
CSA International (Canada)
FM Global  
Safety Equipment Institute
Underwriters Laboratories
American Council of Independent Laboratories

Government Standards Links
Occupational Health & Safety Administration (OSHA)
National Institute for Occupational Safety and Health (NIOSH)
Mine Safety and Health Administration (MSHA)
National Institute of Standards and Technology (NIST)
Environmental Protection Agency
Food and Drug Administration
Responder Knowledge Base (includes the IAB Standardized Equipment List and ODP Approved Equipment List)

This list was updated November 21, 2008 .  We'll try to keep it current.  Please let us know if any of the links don't work, or if there are others we should add to the list.