World Economic Outlook Database
The IMF's World Economic Outlook Database is a free resource that contains selected macroeconomic data series. Data is available from 1980 to the present and includes national accounts, inflation, unemployment rates, balance of payments, fiscal indicators, trade for countries and country groups (aggregates), and commodity prices. While this information is available elsewhere, this database is very easy to use and information is well organized. Tables are in tab deliminated format and easily downloadable to Excel.
http://www.imf.org/external/pubs/ft/weo/2008/01/weodata/index.aspx


