I know that this has been discussed before; but some comments from the article
-Income inequality grew significantly in 2005 with the top 1% (incomes over $348,000) receiving the largest share of the national income since 1928.
-From 2005 IRS records for the bottom 90% the average income dropped slightly compared to the year before, while the top 1% saw an increase of $139,000 or 14%. Apparently the top group increase rely heavily on the stock market and business profits for their income.
Discussing fairness: the IRS estimates that it is able to accurately tax 99% to the wage income, but that it captures only 70% of the business and investment income, which most goes to higher income individuals.
The Center on Budget and Policy Priorities (an advocacy group for the poor) claims that the middle class has had the basic same percentage of total income taken by taxes over the past 40 years, while the income taxes has fallen by half for those at the top although THEIR SHARE OF TOTAL INCOME TAX REVENUE HAS RISEN DESPITE THE CUTS.
Should be interesting when Congress gets around to debating whether to cancel/reversed/let expire the Bush tax cuts and whether it would slow investment and the cost to the economy.