I was introduced to join Kiva.org couple of times, and finally decided to give it a go. Kiva (which means “nice” in Finnish by the way) is a place where people can lend micro loans directly to unique entrepreneurs in the developing world.
I’ve joined casual game group (13 members) and Indie games group (total of 21 members at the time of writing). Together the groups have lent several hundreds of dollars (including my own small lend to mister in Togo, Africa).
I don’t know if Kiva.org is reliable or not, but at least brief search in Google gave me positive feedback about kiva and didn’t see any negative feedback. I leave it for everybody to think on themselves, but if you can think of lending some bucks to developing countries, then it might be worth checking out Kiva.org. And if you join, remember to join the casual & indie game groups there too.