A company called 3PAR is promoting a new idea in computer hardware. When you buy one of their products, they automatically include carbon offsets [1] for the energy it will use. The products themselves aren’t exactly everyday consumer items, but I can see this idea catching on as manufacturers realize that green values can be a differentiator.
[thanks for the link, Adam!]
[1] Wikipedia has more info on carbon offsets. They’re controversial, but I personally think they do real good and raise awareness. If people start thinking about the amount of energy something uses as an added up-front cost, it helps make efficiency part of the buying decision.