I like simple charts.
And anyone whose tagline is "Making the Invisible Hand Visible". The whole site is worth a look.
(as usual with the good graphics sites, click to enlarge, then click again if you are older than 50)
From Visualizing Economics who writes:
New graph I created looking at long-term growth of US GDP per capita, very similar to my earlier graph of US GDP. Will post log version later this week.