brotherhood_of_LAN - 2:25 pm on Jul 5, 2010 (gmt 0)
The first site I ever made was educational, and ended up having more man hours of people reading it than I'll likely ever live.
Now, I'm more interested in money (for the medium term). Financial stability and providing for others is the most meaningful it'll ever get.
However, if I ever end up comfortable, financially, I'd like to get involved in renewables, either selling physical products or spreading the word... which I'd consider highly meaningful in today's world.