Dencity [fathom.info] by Fathom Information Design shows the distribution of global population density in the world.
The map consists of a collection of geo-located circles of varying size and hue value. Maybe counter-intuitively, larger, darker circles show areas with fewer people, while smaller, brighter circles highlight crowded cities. However, as a consequence, denser areas are represented with smaller circles , allowing for additional geographic detail on locations where there are more people, while sparsely populated areas are more vaguely defined.
For people residing in the US, the map is available as a print.