I recently came across this blog and I have really been touched by some of the stories the author (Jill Ginsberg) has posted about her Month of Hundreds. http://jillginsberg.wordpress.com/2010/09 (This is the first post of her blog - continue to October for the best posts.)
Here's a summary of what her blog is about:
"Can $100 change a life? For the recipient? The giver? That is some of what I am setting out to discover. Every day for the month of October, I'm going to give $100 to a stranger I encounter during the course of my routine."
Check it out and you can find some touching and inspiring stories, too.