in reply to The most useless key on my keyboard is:

I don't know about you, but I never touch half the keys on my APL keyboard.

Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart