Country Studies, from the Library of Congress, accesses studies of 100 countries. Political, economic, social systems and institutions are described.
Infonation allows you to view and compare the most up-to-date information on Members States of the United Nations.
The World Factbook provides country information gathered by the US Central Intelligence Agency from many government and private sources.
Yahoo International accesses government, embassy, and other kinds of information about 147 different countries.