Ever wonder if putting solar panels on your roof would be worth it? Just Google it! A couple years ago, Google launched Project Sunroof, a web site that uses images from Google Earth and weather information for your region to determine whether or not you would benefit from solar energy.
The web site shows the cost savings, financing options for installing panels...it even can put you in touch with solar panel providers in your area.
Even if you're not serious about switching, its fun poke around and take a look.