[potatolicious]

There are a few killer features that come to mind (though I'm not sure if Google is already looking at them):

- no paper receipts. Do I want my receipts? In an ideal world, of course, but in real-life that just means more paper junk. Receipts are also awfully easy to lose - making returns onerous. Imagine having an electronic receipt instead of juggling all of that paper!

- doubling up on loyalty cards and payment. Instead of swiping a loyalty card once, and then again for actual payment, a NFC transaction can potentially do both at once. This also reduces the number of cards I have to carry around dramatically. Bonus points if they can make this work with my library card (with the added bonus: if I'm late returning a book, they can just charge me).

- more fine-grained budgeting. Right now Mint knows if I spent $50 at Staples. It doesn't know what, though. An itemized electronic transaction record would tell my budgeting software that the $50 was spent on printer ink, instead of, say, a new gadget.

- immediate feedback without extensive POS modification. I've noticed some grocery store checkouts now have a secondary printer that spits out special offers to you (assuming you scan your frequent shopper card). This can be expanded upon greatly without modifying POS hardware - i.e., pushing promotions directly to your phone.