The creators of Ecofont want to save you ink by drilling tiny holes in your print. Good idea?
Well, while it's free to download and use, Treehugger's testing found that the Ecofont, though readable, really just prints the text lighter. In our guesstimation, you could probably recreate the ink savings of Ecofont by printing your materials in draft mode instead. Plus, that way you can choose the whichever font you like.