As a tech engineer, I'm pretty much always willfully ignorant of how little "greater good" my work is accomplishing. Turns out building a company that sustains themselves while doing notable good in the world is a hard problem. There was even an Ask HN thread the other day where the poster asked for companies in the bay area where you'd feel ethically comfortable working... and the answers were basically just Mozilla and Watsi. But this is a great way to find as many of them as possible, so I'm a fan.