Oil Companies
Anadarko Petroleum	ARC Resources Ltd.	Bahrain Petroleum	BHP Billiton
Bill Barrett Corp	BP	Chesapeake Energy	Chevron
ConocoPhillips	Crimson Exploration	Delta Petroleum	Denbury Resources
Devon Energy	EnCana	Energy XXI	Enerplus Resources
Enervest	EOG Resources	Eni	ExxonMobil
Fairways Offshore	Forest Oil	Husky Energy	Huntington Energy
Jetta Operating	Legado Resources	Marathon	Newfield Exploration
Nexen	Noble Energy	Oxy Inc.	Pengrowth
Petrobank	Petro-Canada (USA)	Petrobras	Pioneer Natural
Plains Exploration	Questar	Quicksilver Resources	Quantum Resources
Repsol YPF	Resolute Nat. Resources	Rimrock Energy	Samson
Shell	Southwestern Energy	Statoil	Sterling Energy USA
Terralliance	Total	TXCO Resources	Tundra Oil & Gas
Ultra Resources	Venoco	Williams Companies	XTO Energy
Networks & Service Providers
Ariba	Biznet Solutions	Cortex Business	DO2 Technologies
Emptoris	EntComm	Hubwoo	Iasta
Ketera	Petronect	Procuri	Quadrem
TransZap (Oildex)	WebDi	Wellogix
Members
Baker Hughes	BJ Services	Cameron	FMC Technologies
Greene, Tweed	Halliburton	M-I Swaco	Schlumberger
Smith International	Trican Well Services	Vetco Gray	Weatherford