As Eric Alterman points out, The Washington Post buried the key stats on the Bush economic plan deep in this article:

An analysis by the Urban-Brookings Tax Policy Center of the effects of eliminating dividend taxation found that the average benefit for those making less than $10,000 would be $6, and the average benefit for those making more than $1 million would be $45,098.

Accelerating the tax cuts slated for 2006, as Bush has proposed, would give 70 percent of the benefit to the top 5 percent of taxpayers, and the lowest 80 percent would receive 6.5 percent of the benefit. His expected proposal to accelerate the 2004 tax cuts would provide 64.4 percent of the benefit to the wealthiest 5 percent and 7.7 percent to the lowest 80 percent.