The Magic Band

We just got back from a vacation at Disney World, Florida

I will not get into details of the vacation, but will only discuss The Magic Band.

We stayed in one of Disney's hotels. When we checked in, each one of us got a plastic band nick named "Magic Band". This band is actually some sort of an RFID tag. (meaning, I think it is RFID, but even if not - it's pretty much equivalent and for all practical purpose can be thought as an RFID tag).

This band is used in the hotel as a door key to your room, and if you enable it, as a pay device at the cashier. We enabled only mom&dad's bands, and then we had to set a payment PIN code, so that kids, or not so nicely finder will not be able to spend it out.

It's only a tag, but it's integrated with the visitor account, data and activities really well.

You can create an account with Disney's web site, and link your vacation reservation there (if you didn't create an account to order the vacation in the first place...), Then you can use the mobile phone app to request FastPass (AKA FP+), and consume those FP+ in the park using the band.
The band, needless to say, is also the admittance tickets to the park, and to other attraction you purchased (i.e. restaurants reservations).

If you lose a kid - nothing unusual in such place - when someone finds him, he is scanned, and they will call your phone number registered in the account to tell you to go grab the brat.
same goes to when you're losing the band itself. Personally, this was not that effective for me, as I was using prepaid sim with a different number on the vacation, but i could (and should) have updated the account with that number.
Depending on the technology of the actual tag - this can also be used for more aggressive usage such as looking for the missing child using band location. Other tag-location based applications are endless, if you open this door...

The most magical feature to me was the photo band assisted linkage.
When you dismount the mt. Splashmore ride, or any other attraction, you see the snapshot where you're topless hands-free or just dumb ass fearful, so you can go the counter and buy it (for a dreadful price). The Magic Band allows you to simply scan it, and have the photo digital file be linked to your account. ingenious!
Wait... that's only the smaller half of it.
When you go outside to the park landscapes, say, you watch the infamous parade, Disney's photographers take your picture over background of the castle, and when they are done - should it be one pick or a set of them - they simply scan your band (or any band of a party member that is under the same reservation), and the images are linked to your account.
So that you can eventually decide to purchase those images for a hefty price.

I found this level of use and integration MAGICAL.