Wealthiest Donors Gave 9 Percent of Their Income in 2007, Study Finds

* In 2007, nearly half of rich people volunteered on nonprofit boards, the most popular form of volunteering. From 2005 to 2007, providing professional services became far less popular among donors, with just 28.4 percent of people reporting they did such volunteer work in 2007 compared with 79.4 percent in 2005.