Mirror images
Maintaining consistency in scales and axes
Area chart
The line-angle illusion
We fail to judge the distance between two lines on a chart.
Aligning the visual and the message
Student of Ray Vella's NYU class produces a delightful project
Two challenging charts showing group distributions
Two complex charts that show subgroup distributions of data
Check out the Lifespan of News project
Kaiser Fung (Junkcharts, Principal Analytics Prep) reviews the Lifespan of News project that tracks the rise and fall of news stories over time and space, using Google search data.
Let's not mix these polarized voters as the medians run away from one another
In-depth look at Washington Post's fantastic feature on median U.S. voters