Kiva is probably the most succesful thing in existence to allow ordinary folks to lend money to other ordinary folks. I've been a member since early 2008, and I think it's a really good idea, which is not to say that Kiva is a particularly good implementation. In fact, we've had our differences. But I keep "reinvesting". I suspect in part because it is, or was, the only game in town. That and inertia. But maybe the time has come to overcome my inertia.