So Google Checkout (not GBuy, or g'bye) has hit the streets. You can go and see the Google Checkout Developer API to intergrate it into your own web-applications.
Interesting note, this is one of the first Google service in awhile that wasn't rolled out as "Beta". I guess it's one thing for users to understand that their email/calendar/maps may be wrong. But don't be messin' with my money!