So Google Wallet was why Sprint sent me a Nexus S a couple weeks ago. At first I blew off the idea of Near Field Communications (NFC) as something I didn't think would really take off (like those little key ring bank tags). But I must say, my first two weeks with an NFC chip have been very eye opening.
For example, I have programmed NFC tags for my home and car. When I get in my car, I touch my phone to the tag, it turns on bluetooth, set's the proper volume and sets the screen to stay illuminated when it's in its dock. When the touch the tag when I exit, it resets to my default settings.
If you visit casa smackie, you touch your phone to the NFC chip by the light switch and it automatically turns on wifi, signs me into my SSID, and opens an app that I use most often when I get home. It's pretty clever stuff. Add a credit card to that and I'm stoked.