I just wanted to pass on a really inspiring online organization that I learned about from Emily Jane - called ItStartsWith.Us - I couldn't help but get wrapped up in its coolness after I started reading about it! From what I understand you'll be emailed one "mission" per week...whether it's writing a comment on a blog that one of the members found of someone who is having a hard time or sending someone a letter...easy!
Here's their blog

"The goal of ItStartsWith.Us is to build a global community of individuals focused on making a positive impact in the lives of the people around them.
Each and every one of us has the ability to change the world by touching lives in this way. And when we hear stories about the positive things others are doing, we become more aware of the opportunities we have to make a difference for the people around us."