For listeners of The Talk Show's marathon keyboard episode, you might remember a brief mention of those templates you used to get with software that fit over the function keys of your old Apple Extended Keyboard.
They're molded from rubber, washable, and fit your keyboard like a glove. Plus, they keep out the dust and crud that keyboards typically accumulate.
Laptop skins are $30, and desktop skins are $40. Fast shipping options are available, too.