This is similar to the 'book flights with Google' service I referenced yesterday. According to this report, "Earlier this year, Google announced it is testing Subscribe with Google with The Guardian, which has managed to turn memberships into a bigger source of revenue than advertising." It's having an impact. "To date, almost 50 publishers from all across the world have begun integrating the product into their operations." How long before MOOC companies, newsletters, and sites like mine all have their own 'subscribe with Google' buttons?