Curiously enough, I have noticed a change in this situation since the last time we discussed it here at AWADtalk. In my admittedly small corner of a small town on a small island in a small country, I now often hear both PIN and ATM without the tautological suffix. It did not use to be so, perhaps its just the Zildian sloth gene working its magic. Whatever the reason, I would guesstimate that I hear both acronyms used correctly more than 50% of the time.