Found on Visual Complexity, this chart from 1924 is an interesting variation of an organization chart. With the authoritarian leader in the center, the subordinates are mapped outward from the center. Rings at different radii show peer level responsibility.
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From CraigStats, the image above shows the population per square mile in the San Francisco area as a pseudo heat map. The site also has combined the apartment listings on Craig's List with Google maps to create pseudo heat maps showing the areas with the most apartments.
The Polar Clock, from Pixel Breaker, version 3 is now out as a screen saver for Mac and Windows. It's also available as a Mac OS X Widget.
I don't know why, but I love this clock. I'm mesmerized watching the seconds going around. With a little practice, you can visualize the time. I won't say this is the best way to visualize the time, but it's definitely fascinating.
Found on VisualComplexity.com, this disturbing poster examines global human trafficking.
"It depicts each country's level of involvement (from Very High to Very Low) as either a country of destination or origin. The project concentrates on the smuggling of people from one country to another - mainly illegally. In many cases these people are forced to do work that is illegal, such as prostitution or child labor."The poster was created by Taulant Bushi, and the original image is here.
The show is full of different visual methods to visual strings, gravity, the scale of particles and multiple dimensions. Brian Greene really did a fantastic job with this show based on his book on the same name.
This last December was the 10th anniversary of Carl Sagan's death. One of his most popular episodes of Cosmos was titled The Dragons of Eden where he first described his Cosmic Calendar. This website from discovery.com has a simple image showing the Cosmic Calendar as Carl described it. A few websites are selling posters of the Cosmic Calendar, like AllPosters.com.
The premise is that if you compress the entire history of the universe into a calendar year, homo sapiens only exist in the last 6 minutes, and the last second represents the last 400+ years of human history.
You can see Cosmos, and hear Carl describe it on YouTube here:
Marumushi.com has a fantastic News Map using the treemap visualization style. This is one of the best implementations of a treemap that I have found. Updated every 6 hours, it groups news stories (from the Google news aggregator) by overall category (technology, world, sports, etc.). You can choose to show the news map from 11 different countries, and the color shading of each block represents how old that particular news story is. Hovering your mouse over any square shows the whole title, and clicking takes you directly to the story.
This is a prime example of how seeing the data visually is better than reading numbers. Here is a population density map from Wikipedia.
We have heard that China and India have most of the human population in the world, but here you can really see and understand how much. Reading that China's population is four times that of the U.S. is much harder than really seeing it on a map.
The Wikipedia page on World Population has some other great information too.