Fire Sprinkler Industry Links:

American Fire Sprinkler Association

National Fire Sprinkler Association

National Fire Protection Association

National Fire Sprinkler Industry

Home Fire Sprinkler Coalition

Society of Fire Protection Engineers

Fire Protection Contractor Magazine

Central Sprinkler Company Voluntary Replacement Program

Fire Sprinkler Educational Links:

Wikipedia article on Fire Sprinklers

Scottsdale, Arizona 10 year study on fire sprinklers

State Farm Insurance study on home fire safety

Prince George's County 12 year study on residential fire sprinklers

Fire Sprinkler Product Links:

Reliable Automatic Sprinkler Company

Victaulic

FlexHead Industries 

Aurora Pump

Peerless Pump

Hydratec Incorporated

Sammy Super Screw Hangers 

Hot Box Insulated Enclosures

Fire-End & Croker Corporation 

Hydra Tech water diffusion fixture

Knox FDC plugs