For the past 10 years, Troy and I have spent a great deal of our time through our companies, speaking engagements and non-profit activities educating people on how to live cleaner, greener lives.
Like most people though, we have had limited funds to spend to make our own living practices environmentally friendly. We looked for those things that we could do that cost nothing or very little to start with - and then over time, we made small purchases to get closer to our dream of having a "zero-energy" home (one that needs no outside energy from the electric grid to power the home).
All of the products and suggestions that we make on this site are those that we have purchased, installed at our home or tried ourselves.
The Clean Power Revolution:
In 2004, Troy wrote a book called "The Clean Power Revolution" that defines the Freedom Plan, a 10 year plan that completely eliminates dependence on foreign oil & dirty fossil fuels. 1.
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An "Eco-friendly" home:

We set out to purchase an ordinary home and turn it into an "eco-friendly" energy-efficient, renewable-powered home over the span of 3 years.
Like most Americans, we have been constrained by a tight budget. This past winter, we are proud to say that we had zero natural gas bills!
Features of the house:
Replace incandescent light bulbs with CFLs. Typically, CFLs use less energy than incandescent bulbs and can last 6-10 times longer. Since the primary output of CFLs is light, they also generate significantly less heat. We recommend CFLs that instantly light up versus those that take a few seconds to brighten. Additionally, these bulbs come in styles that look like incandescents and in a variety of shapes to suit the decor of your home.
Many showerheads are called "water-savers", but are not particularly water efficient. The best way to compare them is by reading the flow rate, in gallons per minute, which is stamped on the showerhead. Most new showerheads are rated at 2.5 gpm and older ones are much higher. By replacing each of your showerheads with a 1.75 showerhead, you get an instant reduction of 3/4 gallon per minute. Considering an average person takes a 10 minute shower, a family of four with save at least $96 per year.
By installing a programmable thermostat in your home, your home is warm/cool when you are home and you save money by not having your heating/cooling system working while you are away. 
Other ideas: For additional energy saving tips, check out the Department of Energy's Energy Savers website.