InfoWorld says Google to offer domain registration services through Google Applications. Now, Google became a registrar back on January 31, 2005. Since then Google said the reason was (1) because they register a lot of domains internally and (2) (not sure if they said this publicly, or if it was inferred) Google uses the registrar data for ranking and trust purposes. You can see our past articles on that speculation with a simple Google search.
As you can see from the Google Applications Help section, Google added one line to the "Cost" section:
Administrators who choose to register a new domain will pay $10 per year for private registration through one of our partners.
They also said, "We have partnered with GoDaddy and Enom to provide this service for $10 per year including private domain registration to help protect you from spam."
So Google is the domain registrar here or is it GoDaddy and Enom?
In any event, it makes sense for this service to be added to Google Applications. Why not add it to Google AdWords Starter Page.