Gapminder is a fantastic resource that provides a fascinating glimpse of a myriad of different indicators of income and development across the world. One of the true virtues of Gapminder is that it allows the user, from her computer, to visualize trends across the world and over time. The user can find information such as clean water levels, GDP, poverty, education, health, etc. Below is a video that shows some of the capabilities of Gapminder, analyzing income and poverty levels worldwide over the last few decades.
Clouds, Clocks, and Sitting at Tables 