Hmm... strange. Maybe Google does want to create a service called "Google Checkout", and even has the domain name for it, but the kind of people they are, you don't know anything until the last moment.
In fact, they could even be preparing for next year's April Fools bash. But I hope its a new service.
And I never knew that Google owned
www.googlemastercard.com. Well, maybe that's for the future ahead, when they'll probably be much more than a $100 billion company.