Google Attempting Cost-Per-Action

Sooner or later, Google was bound to give a nod toward Snap.com, which I recently posted about regarding their Cost-Per-Action ad model. Well, sure enough, they've already started in that direction. And with their recent launch of Google Checkout, you can see how they're intending to bring a measurable (and functional) CPA model to their advertisers, among other things, like the fact that this application, if it has the cajones, could simplify e-commerce on a larger scale for the billions of Internet users out there (like you and I).