Information from the U.S. Dept. of State, focusing on diplomatic and trade relations with individual countries. Links to other government sources and U.S. embassies.

Unclassified report of the CIA providing basic factual information on countries of the world.

Business Ready project...
provides objective measures of business regulations and their enforcement across 183 economies and selected cities at the subnational and regional level. The IFC is a member of the World Bank Group.

UHY is a leading business advisory, consulting and accounting network. Most guides include a section on etiquette and the country's culture.