Hi HN! This is a project I've been working on for the past few days to collect and visualize data about who exactly has been affected by the Federal shutdown, and how. The source and underlying data (which I collected by hand from OMB contingency plans) can be found in my Github:

https://github.com/dandelany/shutdown2013

Cool. What's the difference between the shades of blue?

I'll add a label for this - different shades of blue represent different reasons workers are furlough-exempt. Namely they are either necessary to protect life and property, or their funding comes from somewhere else rather than the appropriations bill.