Over at CNN Money, Tami Luhby attempts to quantify the top 1 percent income earners in the United States. Sample:

[T]here were just under 1.4 million households that qualified for entry. They earned nearly 17% of the nation's income and paid roughly 37% of its income tax.

Collectively, their adjusted gross income was $1.3 trillion. And while $343,927 was the minimum AGI to be included, on average, Top 1-percenters made $960,000. […]

Many workers in the securities industry in New York likely qualify for the Top 1%.

These folks, many of whom work only blocks from where protesters are gathering in Zuccotti Park, made an average salary of just over $311,000 in 2009, according to the state Comptroller's Office. (This figure does not take into account certain income, losses and deductions that make up adjusted gross income.)

A separate study found that financial professionals made up about 14% of the top rank in 2005.

Executives, managers and supervisors working outside of finance accounted for 31%, the largest share, according to an analysis by Jon Bakija of Williams College, Adam Cole of the Treasury Department and Bradley Heim of Indiana University. Medical professionals came in at 15.7%, while lawyers made up 8.4%.