Oil Companies
Anadarko Petroleum	Anderson Energy	Apache	Approach Resources
ARC Resources Ltd.	Bahrain Petroleum	BHP Billiton	Bill Barrett Corp
Black Hills Exploration	BP	Cenovus Energy	Chesapeake Energy
Chevron	Chief Oil & Gas	Common Resources	ConocoPhillips
Crimson Exploration	DCP Midstream	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	Mariner Energy
McMoRan Exploration	Murphy E & P	NAL Resources	Nearburg Producing
Newfield Exploration	Nexen	Noble Energy	Oxy Inc.
Paramount Energy	Pengrowth	Petrobank	Petrobras
Pioneer Natural	Plains Exploration	Quantum Resources	Questar
Quicksilver Resources	Repsol YPF	Resolute	Rosetta Resources
Samson	Sandridge Energy	Shell	Southwestern Energy
Statoil	Sterling Energy USA	Terralliance	Total
Tundra Oil & Gas	TXCO Resources	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	Futura Solutions	Hubwoo	Iasta
Ketera	Pervasive  (WebDI)	Petronect	Procuri
Quadrem	TransZap (Oildex)
Members
Baker Hughes	Cameron	Halliburton
M-I Swaco	Schlumberger	Smith International
Trican Well Services	Vetco International	Weatherford
	(GE Oil & Gas)