Bill payment service Plastiq charges your credit card and then pays the bills you ask them to. That way you can earn credit card rewards for bills you might otherwise pay by check (currently only Mastercards allowed for mortgages), and benefit from convenience and float, charging something at the beginning of a credit card billing cycle and paying it off at the due date weeks after the end of the cycle.
Their CEO did an AMA on Reddit and offered some interesting insights into payments and their business plans.