U.S. Government
CIA World Factbook - Australia
U.S. Embassy in Australia
U.S. State Department's Consular Information Sheet - Australia
U.S. State Department Background Notes on Australia  

Associations and Institutions
Australia Institute
Australian Coal Association
Australian Gas Association
Australian Greenhouse Office
Australian Institute of Petroleum
Australian Petroleum Production and Exploration Association
Australian Pipeline Trust
Australia's Uranium Information Centre
Energy Supply Association of Australia
Enviromission Limited
Securing Australia’s Energy Future (“The White Paper”)

Foreign Government Agencies
AGSO-Geoscience Australia
Australian Bureau of Agricultural and Resource Economics
Australian Embassy in the United States
Australia's Department of Industry, Tourism, and Resources

Oil and Natural Gas
Apache Corporation
BHP Billiton
Caltex Australia
ConocoPhillips Australia
Epic Energy
ExxonMobil Australia
Oilex
Origin Energy
Santos
Shell Australia
Southern Pacific Petroleum/Central Pacific Minerals
Woodside Petroleum

Coal
Australian Mines Atlas

Electricity
AGL
National Electricity Market Management Company
Pacific Hydro