Yes, something similar to OpenID and Googlecheckout. The problem would be that the Yahoo!'s, Microsoft's, and AOL's of the world would not allow Google to cent

Yes, something similar to OpenID and Googlecheckout. The problem would be that the Yahoo!'s, Microsoft's, and AOL's of the world would not allow Google to centrally manage all user IDs and registration information on the web (or they would not be willing participants in the centralization of the information to another for profit company).