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The Dimes Project provides several excellent data sets that describe the structure of the Internet. Using their most recent city edges data (Feb 2007), I created a set of visualizations that display how cities across the globe are interconnected (by router configuration and not physical backbone). In total, there are 89,344 connections.
This rendering displays the relative densities of Internet connectivity across the globe. The stronger the contrast, the more connectivity there is. It is immediately obvious, for example, that North America and Europe are considerably more connected than Africa or South America. However, it is important to note that this only reflects density of connections, and not usage - hundreds of people may utilize a single connection in an internet cafe, often the only form of connectivity people have access to in developing nations.
For additional information, please refer to: http://www.chrisharrison.net/projects/InternetMap/index.html
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