Well, as the Economist reports here, Harvard economist Ricardo Hausmann and César Hidalgo, an MIT physicist who applies his knowledge of networks to economics, have just released The Atlas of Complexity, which is likely to go viral (even though the free sample download is 364 pages and 86 megs). According to Mr. Hausmann:
“The fundamental proposition of the book is that the wealth of nations is driven by productive knowledge. Individuals are limited in the things they can effectively know and use in production so the only way a society can hold more knowledge is by distributing different chunks of knowledge to different people. To use the knowledge, these chunks need to be re-aggregated by connecting people through organizations and markets. The complex web of products and markets is the other side of the coin of the accumulating productive knowledge.”
There’s a few interactive visualizations you can explore online (and export as PDF or SVG) at The Observatory of Economic Complexity.