One giant credit card issuer, Citigroup, will promote the service to its card holders. "Our objective ... is to encourage our card holders to do the majority of their Web spending through their Citi Cards," says Rob Rosenblatt, executive vice president of e-business for Citi Cards. "If card holders feel more secure, it dramatically increases the likelihood that they'll make the transaction."
Google has placed a tour of Google Checkout up that you can look at to get a feel of what the experience would be like. It does look very similar to the fast checkout via PayPal that you see on many sites. If you're interested, you can try it out now at Google's site.