Oil Companies
Anadarko Petroleum	Anderson Energy	Apache	Approach Resources
ARC Resources Ltd.	Bahrain Petroleum	BHP Billiton	Bill Barrett Corp
Black Hills Exploration	BP	Chief Oil & Gas	Chesapeake Energy
Chevron	Cenovus Energy	Common Resources	ConocoPhillips
Crimson Exploration	Delta Petroleum	Denbury Resources	Devon Energy
El Paso	Energy XXI	Enerplus Resources	Enervest
Eni	EOG Resources	Fairways Offshore	Forest Oil
Huntington Energy	Husky Energy	Jetta Operating	Legacy Resources
Legado Resources	Marathon	McMoRan Exploration	Nearburg Producing
Newfield Exploration	Nexen	Noble Energy	Oxy Inc.
Paramount Energy	Pengrowth	Petrobank	Petrobras
Petro-Canada (USA)	Pioneer Natural	Plains Exploration	Quantum Resources
Questar	Quicksilver Resources	Repsol YPF	Resolute
Rimrock Energy	Rosetta Resources	Samson	Sandridge Energy
Shell	Southwestern Energy	StatoilHydro	Sterling Energy USA
Terralliance	Total	TXCO Resources	Tundra Oil & Gas
Ultra Resources	Vantage Energy	Venoco	Williams Companies
XTO Energy	Yates Petroleum
Networks & Service Providers
8over8 Ltd.	Amalto	Ariba	Basware
Biznet Solutions	Cortex Business	DO2 Technologies	Emptoris
EntComm	Hubwoo	Iasta	Ketera
Petronect	Procuri	Quadrem	TransZap (Oildex)
Members
Baker Hughes	BJ Services	Cameron	Halliburton
M-I Swaco	Schlumberger	Smith International	Trican Well Services
	Vetco International	Weatherford
	(GE Oil & Gas)