A few months ago I loaned $25 to 5 women in the Dominican Republic thru an online micro-lending service called Kiva. Kiva works with "field partners" around the world, organizations that actually oversee the administration and repayment of each loan. It turned out that there was a problem (which the field partner in the Dominican Republic identified) which prevented the loan from going thru, so while Kiva and the field partner sorted things out, Kiva refunded my $25 which meant I could loan that money to someone else.
So I looked thru Kiva's loan listings and selected a man in the Congo who wanted a loan to increase the profit he made in his biscuit-selling business by adding purified water. And last week I got an email letting me know that he'd already posted his first loan payment of $1.56. Woo-hoo!
Kiva's a really neat organization. If you're looking for a way to help small (really small) business entrepreneurs in poor countries around the world, and you don't have a lot of money to lend, this could be the site for you.