"Dubbed Google Checkout, the system is designed to boost Google's main source of revenue - selling advertising. The service offers some free order processing to Google's millions of advertisers, but will initially be available only to stores in the US.

Google says it will enable shoppers to set up a single account with all their credit card and delivery details, allowing online merchants to sell through their Google advertising. For every dollar they spend on advertising, merchants will get $10 off the cost of processing orders they receive."