Wow! That's really cool! So glad you sent it - we're starting to map some of our involvement across Minnesota and the world and are going to do some data visualizations. Check out this conference - there are a bunch of presenters who do data viz - http://eyeofestival.com/
I heard about this from a talk by Robert Stephens and just had to share:
D3 (Data-Driven Documents)
http://d3js.org/Anyone using it?
OIT - IS