Ecofont

I love this one: By changing your font, you can use 20% less ink when printing documents. Ecofont has tiny holes in it that are imperceptible at 10 point and below (I can see them if I look really hard when printed in 11 point on my pretty low-end HP laser printer). The font was easy to download and install (clear instructions are provided) -- the only trick for me was looking for the font under its full name of "Spranq eco sans" rather than "ecofont" in Word's font list. It looks a little lighter on-screen, too, so I'd say it's best for people that actually print their documents, not just read them on-screen.

Comments

[Color Cartridge]

The free Ecofont vera sans has evolved into software that shoots holes in your fonts.
It works with your current fonts, so no need to change your docs or house style.
It doesn’t matter if you have a HP, Ricoh, Xerox, Canon, Lexmark, Oki, Lexmark, Samsung, Sharp or any other printer/copier. You can save more than 25% toner on all devices.

It is not hard to imagine why printer vendors are not happy with Ecofont, this is going to hit them hard.