The Samsung Galaxy S III is a large phone and mounting options are not terribly plentiful. The dimensions of the phone often exceed the dimensions of universal mounting solutions. Fortunately we have uncovered some excellent solutions from our buddies at Arkon that grasp your phone from the top and bottom. All ports and buttons are exposed and accessible.
We especially like the powered lighter mount which enables you to power your device using the integrated micro USB cable.
As always, we show some pictures and provide links.
Powered Lighter Mount for Samsung Galaxy S III
Car Cup Holder Mount for Samsung Galaxy S III
Car Seat Bolt Mount for Samsung Galaxy S III
No Glue Dash Console Mount for Samsung Galaxy S III
Suction Cup Mount for Samsung Galaxy S III
Samsung Galaxy S III Bean Bag Mount
MountGuys Blog 