Marriott Hotels, Marriott international's largest brand, said today that it plans to roll-out mobile check-in at 325 hotels in the U.S. and Canada. Already, 31 Marriott hotels have introduced mobile check-in. All Marriott Rewards members will be eligible for the service. They will be able to check in after 4 p.m. the day before their arrival. Once their room is ready, they'll get an automatic notification. Because their credit card information is already stored in their Marriott Rewards profiles, all they have to do once they arrive at the hotel is walk up to a mobile check-in desk and pick up their pre-programmed key card. Get the full story at USA Today