It's here, after much talk about it over past months. It's called Google Checkout and it's live in the US now, primed to spread around the world soon.[The Register]Google says there are various options for including the system on websites - from cut-and-paste buttons, to APIs that allow integration with commerce platforms such as MonsterCommerce and ChannelAdvisor.
Customers without a Google ID can create one from the merchant's site at the time of purchase.