we had a kid (seriously he was 17) that figured all this out and over about 3 months was taking the sign up forms and the journal and copying down info when he closed alone.
In 2004, there were new laws passed to combat that. Any merchant using swipers or what-have-you was required to update their machines to display only the expiration date and last four digits on receipts and journals. I remember having to do this, as each terminal took about a half-hour to update. They'd phone home at 2400 bps, and do a flash...doesn't sound like much, but it is at sublight speeds.
This Apple Store solution has us excited though. Our company provides ticketing and e-commerce support for nightclubs, record labels, and musicians. Right now, I'm on tour with one of the world's top DJs, doing e-commerce and ticketing support at each of his shows. We use 4 Symbol/Motorola MC7090 scanners all running to a Netgear Wi-Fi access point, which then gets the data off of my Macbook. Our system is platform-agnostic (it's a web app) except on the POS/handheld end, where we were pretty much limited to Symbol and thus, Windows Mobile. For a "Mac shop" such as ourselves, this was horrid, but then again we got the MCs for free (long story) so we dealt with it, all the while hoping for a laser barcode scanning attachment for iPods/iPhones.
Basically, our system works like airline e-tickets. You purchase, print out a barcode, and our system checks you in at the event.
Now, the Symbol scanners and charging docks are clunky and huge. I carry a big road case with 4 scanners, power, and their chargers. Costly for touring since it's checked luggage.
4 iPod "POS" units and their docks? That could go in my jacket pockets.
Are they ugly by Apple standards? Sure, but they're a sight prettier than the Symbol units. And iPods, we can really sell to image-conscious nightclubs. They love the system, but the Symbol scanners don't go over so well. One guy commented "Oh, it's a lifesaver but with this thing I feel like the checkout guy at the Apple Store..."
So, Apple, if you're watching, you've got one merchant/retail/commerce operation right here that will buy these things in droves.