If you haven't heard of the New Hampshire Carbon Challenge, it's worth checking out:
The program's goal is to "educate, inspire and support sustained reductions in residential energy consumption."
One of the best things about the website, http://carbonchallenge.sr.unh.edu, is its New England Carbon Estimator: http://carbonchallenge.sr.unh.edu/calculator.jsp.
It takes only 10 to 15 minutes to use the Carbon Estimator and take the challenge, but according to the site, the people who do save an average of $751 per household per year. That seems like reason enough!
The Carbon Estimator helps you select actions to reduce your energy usage and also estimates what you might expect to save. Carbon Challenge takers have saved a total of $1,344,425 so far, according to the site.
Links:
[1] http://carbonchallenge.sr.unh.edu
[2] http://carbonchallenge.sr.unh.edu/calculator.jsp
[3] http://www.greenguidenh.com/content/392/carbon-challenge