Size of countries
Share of World GDP (PPP adjusted), 2014, all countries.
Size of countries (GDP) at market exchange rates. 2014, all countries.
Efficiency and Productivity
Demographics and Aging
Convergence 1980-2014 (interactive), all countries.
Determinants of convergence
The Shape of Business Cycles and Financial Markets
Business Cycles 1980-2019, selected countries.
Robert Shiller data on the US stock market and PE valuations.
Imbalances and Debt
Current Account Balance (as % of GDP), 2014, all countries.
Income inequality
Antonio Fatas Blog on Macroeconomics
Mark Thoma's Blog (More academic, but lots of additional links)
Paul Krugman's Blog on the NY Times (expect some strong views).
IMF World Economic Outlook (new issue every 6 months, updated every 3 months).
Project Syndicate (Economics Section). A great source of economic analysis.
And if still lost... Send me an email.