Buy Energy Star rated appliances.We got a new gas stove and refrigerator when we bought our home five years ago, so that was great- but we weren't all that concerned with looking at energy ratings then. Even so, I think both of them ended up being that way. We also recently purchased a new dishwasher, which we made sure was energy star. You can even purchase energy star televsions, which we have done for the living room, and bedrooms. Most LCDs are enery star rated anyway, so you can't go wrong there!
The next big items we will most likely update will be the washer and dryer when we move to a new home, but so far I think using our current ones are saving the world from producing new ones, so that helps the earth too.
So, if you are in the market for a new appliance or television, please check into energy star ratings- it will help you and the earth.