Heatmaps allow us to visualize the change in a particular variable over a certain period of time or area. I found some neat heatmaps that were worth sharing.
Person scanning a website
(Courtesy: Tobii.com)
Change in economic indicators under each President
(Courtesy: NY Times)
UV Levels across the globe on 18-OCT-2008
(Courtesy: Temis.nl)
Radon Levels in the US
(Courtesy: Pillartopost.com)
Ozone levels in 2008
(Courtesy: ESA.int)
Traffic congestion in San Francisco and Los Angeles
(Courtesy: fortiusone.com)
Sun before and at the time of a solar flare
(Courtesy: NASA.gov)
Treemap in Excel – Coming Soon 
Chart Table – When Chart meets Table 
How to Choose a Chart 
Chartjunk 
Where did my money go ? 
Make Charts in Excel Using Symbols 
