I have updated my most popular graph Average Income in the United States. It now includes data through 2006 (in 2006$). I also added recessions from National Bureau of Economic Research
{Click on the image to take a closer look}

Data from Emmanuel Saez’s web site
Technorati Tags: Average Income, United States, Recessions
Popularity: 2% [?]
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Found the top graph via Paul Krugman’s blog. It is from a paper by Larry Bartels, professor of politics and public affairs at Princeton University.
{Click on the image to take a closer look}

I found a second graph in the same paper, showing the income inequality year to year (the 80/20 ratio measures the income inequality by dividing the income earned by someone at the 80th percentile by someone at the 20th percentile). Additionally, Bartels has highlighted the years Democrats and Republicans held the White House. Like a number of graphs on my site, you can see the increase in income inequality since the early 70s.
{Click on the image to take a closer look}

Data in the graphs are calculated from the Historical Income Inequality Tables compiled by the U.S. Census Bureau.
Addendum
5/2/08 Fix my definition of 80/20 income ratio
Technorati Tags: income, United States, inequality, Bartels
Popularity: 2% [?]
From the New York Times

Technorati Tags: Happiness, United States, Income
Popularity: 6% [?]
This graph shows the different types of income of the “Top 400″ from 1992-2005. Number one source of income is Capital Gains, which accounts for more than 50% of their income in 2005.
The “Top 400″ are the 400 tax returns with the highest adjusted gross income reported to the IRS.
{Click on the image to take a closer look}

Data from the IRS via Wall Street Journal’s Tax Report
Technorati Tags: Tax Rates, United States, Income tax, IRS
Popularity: 4% [?]
This graph shows the average income reported to the IRS and the average taxes paid by the top 400, i.e. the 400 taxes returns with the highest adjusted gross income from 1992-2005. This does not represent not gains in the wealth of people like Bill Gates but instead shows the annual income of the superrich reported to the IRS. They accounted for 1.15% of total income reported in 2005, more than twice as large as their 0.49% share in 1995.
{Click on the image to take a closer look}

Data from the IRS via Wall Street Journal’s Tax Report
Technorati Tags: Tax Rates, United States, Income tax, IRS
Popularity: 8% [?]