U.S. Government
CIA World Factbook - Sudan
USAID - Sudan
U.S. State Department Travel Warning - Sudan
U.S. State Department Consular Information Sheet - Sudan

General Information
Arab Net: Sudan
BBC Country Profile: Sudan
Darfur Information Center
Human Rights Watch: "Sudan, Oil and Human Rights"
Latest News from Sudan at Sudan.net
Sudan.Net
University of Pennsylvania African Studies: Sudan
Washington Post World Reference: Sudan

Foreign Government Agencies
Embassy of the Republic of Sudan

Electricity
National Electricity Corporation

Oil and Natural Gas
China National Petroleum Company (CNPC)
Oil and Natural Gas Corporation (ONGC)
Petronas