Yes, on our Nov/Dec 06 trip. I had booked two rooms one for myself and my kids and one for my mother with my aunt and uncle.
On the confirmations I saw and printed off the internet plus the ones they sent to my home mutliple times, all the info was correct.
When we showed up at the AKL they couldn't find our ressie. After about 30mins in the back office with a manager they found my ressie but all of the info was wrong. It showed I lived somewhere in Georgia!!!(I live in Canada) The only info that was correct was our confirmation #'s. They worked it out and upgraded our rooms but I was nervous for a while because I had great AP rates for our trip.
So I print everything and bring all my info not just confirmation #'s for flights, hotels, car rentals, tickets.