If you are an old AdSense publisher that signed up from the service when it was launched, you probably don’t have it integrated with the Google Account you’re using. If so, you might be getting the above screen when trying to login. They’re trying to migrate users from one part to another, just like they did to the Blogger accounts.
We’re rolling out this migration slowly, so please don’t be alarmed if you don’t see this wizard in your account yet. If you like the email address you’re already using, in most cases you’ll be able to upgrade it to a Google Account and keep the same login and password. However, if you use another email address for other Google products like Gmail and Picasaweb, you already have a Google Account and you can finally use the same login for AdSense. Please note, however, that at this time it’s not possible to update your login to an email address that is already being used as a login for AdWords or another AdSense account. We’re working on fixing this, and you won’t be required to migrate until we do.
