UNData contains information from all major UN databases and those of several other international organizations. The design allows a user to access a large number of UN databases either by browsing the data series or through a keyword search.

The Census Bureau collection of data and links to hundreds of international datasets.

Eurostat is the statistical office of the European Union situated in Luxembourg. Its task is to provide the European Union with statistics at European level that enable comparisons between countries and regions.

Brief country data on youth and the elderly, cities, housing, water supply, income, health, education, literacy and unemployment.

Web version summarizes regional and country statistics on economic, social, and educational development.

Lists indicators for countries by life expectancy, literacy, education and GDP.

This site has many international economic statistics by country, region, and subject.

This site provides the latest international data available, mainly from creditor sources, on the external debt of developing and transition countries and territories.

A directory of resources on international economics. It is very comprehensive, but does not annotate the links or clearly explain their strengths and weaknesses.

This site, part of the Economics Departments, Institutes and Research Centers in the World site, has links to the Statistical Departments of each country of the world.

This site has a high quality internet resources catalogue that gives Websites related to Economics by controlled subject heading. It has a variety of international data with a large amount of supporting worksheets and materials aimed at students who might be using that data. It has links to data on British companies. Bized also hosts The Virtual Economy - a web based model of the UK economy which allows students to change a wide range of (British) economic variables such as direct and indirect taxation and to see graphs and pictures of the macro and micro results of their changes.
http://www.bized.co.uk/dataserv/datahome.htm

You have to register, but for people from a Dot EDU addresses, you can use the DIBS service for free.