The World Bank has recently expanded public access to their datasets on a huge scale (many previously only available by subscription). You can view data by country or topic, create a map out of any indicator, download the raw data, and there’s even an iphone app. They are also reaching out to developers to create additional tools and apps. Unlike many UN/WB/IMF online databases, this one is intuitive and easy to explore. (List of available datasets)
An addictive collection of beautiful charts, graphs, maps, and interactive data visualization toys -- on topics from around the world.