Ranking of economies. The World Bank. DbVisualizer - The Universal Database Tool. Economic, Financial, and Demographic Data. Finding and downloading economic data have never been this fast, simple or free!
Dismal Scientist Relevant, easy-to-understand global economic information in real time "Fifteen minutes with Dismal saves you three hours... " Pete Gioia U.S. Penn World Tables 6.3. (189 countries, 1950-2007, 2005 as base year) The Penn World Table provides purchasing power parity and national income accounts converted to international prices for 189 countries for some or all of the years 1950-2007.
The European Union or the OECD provide more detailed purchasing power and real product estimates for their countries and the World Bank makes current price estimates for most PWT countries at the GDP level. Public data. UNdata. Organisation for Economic Co-operation and Development. CIFP - Country Indicators for Foreign Policy. Publications and documents.