I have just completed making my list for my swap - 100 Things I would like to do before I die. I decided to search on this topic. I see many people have done their own list. There are even generic ones where you can just tick off (i have done a lot of things on those list).
In the process I started thinking about what can I do for others. I found this free e-book: 101 Ways to Change the World from Together We Can Change the World Publishers. In the book there is a link to a movie called Be The Difference.
I thought this was really some great stuff - some things listed are elementary (you are probably doing it already) but its sometimes good to get affirmation that what we are doing does make a difference.