One of my favorite sites is Kiva.org. You can loan money to small business owners around the world. Then when they repay the money, you can loan it right out again to someone else! You get to choose what projects you fund—by gender, by country, by what type of business they're running. They also have loans for people who need housing or computers. It's a way to give people living in poor areas some help—and since it's a loan, you're giving a hand up, not a handout.
Until August 14, Kiva is giving away a limited number of free trials! Use this link to get your free $25 to start lending. Hurry! Someone needs your help!