I like your idea about tithing, @bchick. I'm far from being religious, but I completely agree that everything belongs to God (or I'd say everything IS God, but let me not stray too far from your idea), and we are merely using it for a while. So in all our actions we should give back. Return surplus. I'm not sure how to calculate the 10%, but the rate is small enough to be realistic, while still large enough to make an impact.