Executive Salary Comparison
Portfolio.com has a number of good interactive infographics on their News & Markets/Multimedia page.
This Salary Comparison is simple but hugely informative showing the difference in number and visual representation of size, but also over time as you move the slider on the left. In 2005 the difference between the average worker and the CEO is so large it doesn't fit on the screen anymore. But that is down from 2000 when the difference was the largest at 548x.