Aggregation Getting the basics right is half the battle I was traveling quite a lot recently, and last week, read the
Spider chart An overused chart, why it fails, and how to fix it A chart with conceptual appeal but fails the data
Area chart Spatial perception: on the chart and in real life A twitter follower @mdjoner felt that something is amiss with the squares
Design Knowledge in the chart and knowledge in the head One of the many insights from Don Norman's great design