Original source: http://en.rian.ru/infographics/20100419/158609048.html
Rehosted image: http://i13.photobucket.com/albums/a270/Insig/158654371.jpg
This map is one of many produced during the volcanic eruption in Iceland to show the airport closures caused by the ash cloud over Europe. I like this particular map because it shows (and, just as importantly, gives the names of) all of the countries that have closed or restricted their airspace. It also shows the general projected shape of the ash cloud. Each piece of the graphic is clearly labeled, and there are random interesting facts scattered around the image. Overall, it is just a very clean graphic that shows a lot of useful information without being too cluttered or dense.