The Dive Matrix - Great NEW forum where Dive Talk reigns... Be sure to join!
Scubaboard - Great Place to spend your Surface Interval.
FifthD-X - Helpful and very friendly westcoast forum for DIR divers
Deep Sea Supply - Manufacturer of well designed Backplates, wings and other great gear (My favorite)
Scubatoys.com - For all things scuba, great reputation and will price match.
Oahu Dive Shops Ops and Clubs
Scuba and Dreams - Great training, tech, wreck and more.
Maui Dive Shops and Ops
Pacific Dive - My favorite shop to deal with in the Lahaina area.
B&B Scuba - My favorite boat operator to Molokini + Great shop in the Kihei area.
Maui Dreams Dive Company - Another great shop to do business with in Kihei and good weather reports on their website for divers.
Extended Horizons - For trips to the Lanai Cathedrals and the Carthaginian
Maui Weather Forecast - overview of Maui weather
Stormsurf Wave Model for Hawaii - my favorite place to check upcoming wave conditions
Relevant Hawaii State Laws
Dive Flag rules - See third section §13-245-9 Diver's flag.
Information for the Learning Diver
South Florida Spearfishing Club - GREAT Scuba calculators for calculating SAC, MOD, etc..
Rockbottom and Gas Management - The Title says it all - Should be required reading for divers
The Divers Ear - Excellent video from the University of WA on Ear equalization and barotrauma.
Current U.S. Navy Dive manual, over 900 pages of information on diving air, mixed gases, CCR, recompression chamber operations and more.