Organizations:
Tripoli Rocketry Association National high power rocketry/Experimental organization.
National Association of Rocketry National organization supporting all kinds of consumer rocketry.

Vendors:

Aerocon Systems If you need one, Aerocon has one. A great resource for the amateur rocketeer.
Quickburst Hot motor ignition products.
Aerotech Manufacturer of solid rocket motors for MR, LMR and HPR..
VooDoo Digital Productions Producer of excellent DVD's of east coast rocketry action.

X-ROCKETS Very reliable Hypertek drop stem alternative.
Pratt Hobbies Pratt Hobbies is all about rockets, and all about hybrid propulsion.

Miller Motor Works Serving the Michigan HPR market with quality products.

Commonwealth Displays Full service mail order and walk in rocket shop.

Public Missiles, LTD. Manufacturer of kits and components for all sport rocketry activity.

LOC/Precision Manufacturers of kits and components from mid-power through the upper end of high-power.

Giant Leap Rocketry  Innovative products and materials for the HPR flier.

BoosterVision  Lightweight and powerful wireless video cameras for onboard video in almost any rocket.

Rocketry Pages:
Fly Hybrids! Excellent resource maintained by Doug Pratt for the hybrid enthusiast.
Rocketry Online Your one stop for all rocketry information.

Rocketry Planet Informative rocketry news resource.
Fly Rockets!  Web site covering all that is recreational rocketry.

HDAS Hybrid Design Spreadsheet A tool that can be used to design your own U/C valve hybrids - written and assembled by Todd Moore.

Forums:

Yahoo Hybrid Group Hybrid discussion group moderated by Doug Pratt

Newtons 3rd Rocketry Forum Todd from Sky Ripper Systems frequents this forum.

MySpace:

G33K Myspace Page  Todd's musical project.