Reef Clubs:

Chesapeake Marine Aquarium Society
Washington Area Marine Aquarium Society

Forums:

Reef Central
Reef Aquarium Guide
Reef Sanctuary
Extreme Reef
Reefs.org
Reefland
Reeftalk
CMAS
WAMAS
Saltwaterfish.com
Aqualink

Online Magazines:

Adanaced Aquarist
Reefkeeping

Supplies:

Premium Aquatics
Ocean Encounter
North Coast Marines

Corals:

Dr Mac and Sons
Cquarium
The Logical Reef
Ecorals
Reeffarmers
Aquaprop
Aquadesignz
Reef Science
Phishy Business
Blowfish Aquatics
Reefer Madness
Exotic Reefs
Palmetto Reefs
Reefaholics