I found this Minneapolis Star-Tribune article very interesting yesterday:
50 Ways to Eat Green
I don't come close to doing it all, but it intrigues me. I could take some steps. Animal, Vegetable, Miracle and some other things I've read have raised my awareness.
I do think that saving energy by turning your teapot off before it whistles is a bit over the top. That's a matter of seconds. You might let your spaghetti sauce cook an extra 15 minutes or your soup an extra hour. Leaving your oven on too long is wasteful, but I'm not going to worry about my tea kettle.