A Great Visual Communication Resource - Worldmapper
This post is a little off topic from documentation but it's a great resource I came across from my alma mater's listserv.
Introducing... Worldmapper! http://www.worldmapper.org
According to their website, "Worldmapper is a collection of world maps, where territories are re-sized on each map according to the subject of interest… There are now nearly 600 maps."
Did you read what I read? 600 maps for us to click around, play with, and in general become more aware about the world we live in. I especially recommend you spend some time learning a bunch of cool things in the Map Categories section.
366 of the maps are available as PDF posters. This is definitely a great resource if you need a visual to communicate an important point.
Here's an example of a map based on total population…

And another example, based on road traffic deaths…

I guess the traffic in Charleston doesn't seem so bad now.