http://www.geekologie.com/2008/08/zero_carbon_footprint_the_sola.php

A solar-powered ice maker. Hopefully this will see some sort of commercialization so that it can be used as a zero-carbon freezer someday.

Used solar panels

One big issue people have with using solar energy is the prohibitive cost of a new solar system. It can take many years to recoup the upfront cost.

According to an article on CleanTechnica.com, though, used solar panels are much less expensive, possibly even free. Michelle Bennett, the author of the above article, outlines a few steps for finding those inexpensive panels.