Google Checkout is adding multi-user capability. Online merchants often need to give access to their payment accounts to employees. Google said it would begin allowing account holders (administrators) to add multiple users to their Google Checkout accounts while still maintaining sole control of important account and payment-related information. Additional users will be able to view order-related information, perform order searches, and view the order inbox. However, they will not be able to take any actions on the orders, view payments, or modify account settings.

http://googlecheckout.blogspot.com/2008/02/additional-users-more-merrier.html