Know more about Google Wallet after the break.
Google phones with NFC technology will be able to use Google wallet. You can put your credit card details in your google wallet then use google wallet instead of your credit card. if you dont have a credit card you can buy Google wallet prepaid cards and load it to your Google wallet.
with google wallet no need to sign or swipe any cards. just tap your phone and key in your pin and you're paid.
with Google wallet too you can have mobile coupons too that you can use on your shopping.
to know more about google wallet you can watch this youtube video created by Engadget.com
or watch this advert created by google
for all the details about Google wallet go to http://www.google.com/wallet/