Part of the idea behind this blog is that green computing covers more than just the environmental aspects. Sure, we want make sure that we not using a lot of heavy metals in their production, or those 15 inch monitors you have lying around with ten pounds of lead in them don't end up in the farmer's field. But we also want to be sure sure that we are delivering IT services as efficiently as possible. It's a pretty simple equation: efficiency = $. It's a money thing. How much money? Most IT budgets could be cut in half.
This is a fun article on the merits of using Linux to save money in this way. Lot of good points here.