Yale University's G-Econ Project has developed new maps and data on global economic activity. The project, led by renowned economist William Nordhaus, the Sterling Professor of economics, provides estimates of "gross cell product" for the entire globe. I've uploaded maps for the US, Europe, India and China, where you can clearly see how spiky world economic activity is. More country maps along with a detailed description and its data-sets are here. A way cool animation of global economic activity is here.