Kiva
Kiva is an online service that connects lenders to small business borrowers in developing countries. Kiva partners with existing microfinance institutions. By choosing a business on Kiva.org, a lender can sponsor a business and help a few of the world's working poor stride towards economic independence. Loans can be made instantly via PayPal, which does not charge for the service. Throughout the course of the loan (usually 6-12 months), the lender can receive email journal updates from the business you've sponsored. As loans are repaid, you get your loan money back. Borrowers, screened by the local microfinance institution, can get small amounts of money relatively quickly. The website claims over US$4 million in loans, with an excellent repayment scheduler.