Striking it Richer

http://elsa.berkeley.edu/~saez/saez-UStopincomes-2007.pdf

The top .01% (top 14,988 US families, making at least $11.5m in 2007) share increased from 5.46% in 2006 to 6.04% in 2007

So the top 1/10,000 families had 6.0% of U.S. income.
Note that this is even higher than the time preceding the Great Depression. Such severe income inequality leads to severe economic downturns by more than one mechanisms.