Ecofont - a font full of holes - is designed to minimize the amount of ink needed to print characters in a legible fashion. This ingeniously simple green-tech solution can supposedly use up to 20% less resources without sacrificing readability.
A free download, Ecofont is ideal for casual printing, saving ink on unimportant documents, but clearly unintended for more important works, i.e. wills, final exams, dissertations, etc. [via lifehacker]