With its built-in GPS and various map applications, you can use the Samsung Galaxy S phones as a navigation device, and though it's easy to view the screen while navigating on foot, what about when in the car? Try a mounting kit like the Samsung Galaxy S Vehicle Mount. It includes a cradle to hold your smartphone and an adjustable arm that attaches to your windshield via suction cup. There's also a built-in power port, so you can charge your device while in the car. It's available for $39.99.