PERCENTILES BY PERCENTAGE OF FEDERAL
AGI TAX PAID

Top 1 % 39.89 %
Top 5 % 60.14 % 2006
Top 10 % 70.79 %
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Top 1 % 39.38 %
Top 5 % 59.67 % 2005
Top 10 % 70.30 %
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Top 1 % 36.39 %
Top 5 % 57.13 % 2004
Top 10 % 68.19 %
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Couldnt find the last two years anywhere, but evident the top 10 % 's share of the tax has increased and is just about 2/3 of the total !!

http://www.ntu.org/main/page.php?PageID=6

By the way, in 2003 the top 10% paid 65.84% of federal tax and grew to 70.79% in 2006 !!!