[theantidote]

Maybe invest $100-200 in microloans but Kiva at least doesn't pay you any interest on the loans. I don't know about the other two organizations. These are different from charities in that they aren't tax deductible so if that's important for you then look elsewhere.

I heard some advice on the radio the other day: invest your age in bonds. So a 40 year old would put 40% of their invesments into bonds. Bonds are slow but reliable sources of income and are basically the same as a loan to a large corporation. Try that if you're looking to back loans and earn interest.