Google recently launched "Google Checkout", it provides small and medium business to take a leap in lowering their transaction rates, and the rates are lower compared to industry standards.

Read this interesting article on Small Business computing about Google Checkout
http://www.smallbusinesscomputing.co...le.php/3617421

It will most likely have some challenges, since every e-Commerce vendor and business owner need to integrate within their website, by doing so it will provide the consumers/shoppers to have, a "unified checkout/payment history", that they can keep track of their shopping records.

Also, visit the below link for real time screenshots, providing you a step by step integration of Google Checkout.
http://www.info-sourcing.com/Web_Sol...ut_process.htm

For more information about Google Checkout visit http://checkout.google.com