http://www.amazon.com/dp/B002PXRO04/Beam N Read EXTRA BOLD, Large Print Keyboard Stickers, 4 High Contrast Color Combinations for PC & Mac
Shortly after joining geekhack, I went looking for rub-on lettering, the kind that we used to use in the architectural trade before computers destroyed the artistry of the profession. I couldn't find them anywhere. I did find several kinds of stickers, but hadn't seen any specifically designed for keyboards, until I stumbled upon these today. I thought y'all might find these interesting. (and if anyone knows where you can still get those rub on letters, please PM me!)