I was just listening to one of the Podcasts and Paul was discussing which of his actions has expanded his empire the best vs. just preaching to the choir.
I'm a PodCast guy, who got to you from Doomsday Preppers>Thesurvivalpodcast>Permies.
I listen to a lot of other podcasts including TWIT and Gina Tripani has an app that you may find interesting called ThinkUp.com which allows you to see the effectiveness of your actions.
I have no link to Gina or ThinkUp other than I listen to her on TWIT.TV.
The app is still in Beta, but I think she is opening it soon.
Best of luck saving the world, I want to help out all I can.