[Kaali]

Apple has started doing something about energy efficiency, probably because most of their computers are laptops where energy use is quite important. OSX tracks energy efficiency, which somehow calculates how much power a single application uses (CPU + GPU if I remember correctly). But I don't think they do anything with that info at the moment.

I guess it would be a nice incentive for developers if OSX could notify you that an app that is on background is using a lot of energy at the moment, maybe even with a quit-button when on battery power. At least I wouldn't want my app to end up on that kind of a popup.