How much do billionaires give?
In June, Warren Buffett and Bill and Melinda Gates challenged the nation's billionaires to give away at least half of their net worth. Here's how 9 big spenders dole out their money.
Philanthropist and businessman George Soros has given away more than $8 billion since 1979, mostly to support human rights.
NEXT: Larry Ellison
Last updated December 14 2010: 8:44 PM ET