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It was made by Miles Ward on the AWS team but you can made a similar one at http://www.madeiracloud.com/ (and provision directly from the diagram / overlay monitoring info)

It links to an Amazon case study:

http://aws.amazon.com/solutions/case-studies/obama/

(which then links back to the map)

I tried to figure out what software this was from, but I gave up. I did find that Wikipedia has a nice list of network diagram software here http://en.wikipedia.org/wiki/Comparison_of_network_diagram_s...

I'd love to describe a network in (something like) graphviz dot notation and get a diagram that looks like this out the other end. Usually I wind up just using Visio and doing it by hand because work pays for it anyway, and it's actually very nice.

It's good 'ol Inkscape :)

Thanks for the answer! I was just playing with Inkscape the other day, I'll make a point of learning it for real next time I need to put something like this together.