I think there is enough interest in saving on your heating and electric bill to fill another section on the site. LEDs are a big hit thing, and there isn't enough DIY talk about it on the net and what real world numbers are like. The only other sources of info I can get on DIY LED Lighting is on LED based forums.
I could be wrong with the interest, but it does seem to be a large topic. Since this site is based on saving money driving a car, I think this section could fit in fairly well, and I'm sure there are members here that know plenty of things to make your house more efficent other than rebuilding it from the ground up.