I verified what I believed to be accurate information. Check out the following:
http://www.house.gov/jct/x-2-01.pdf
This is for year 2001. I think it is accurate to say that the top 10% pay more than 65% in tax revenue in income tax alone. I think the lower wage earning groups pay at a higher rate when payroll taxes are added in, but the majority of the federal revenue is still paid by the "rich". One must also understand, if a rich man is employing wage earners, he is essentially paying for half of the payroll tax out of what either could be profit or higher wages.
There is a great web site called economagic that may have much of the info that we could use to further discussion on this topic and others.