Swipe Navigation is a cool Android app that lets you use intuitive gestures instead of the buttons on the black navigation bar at the bottom of the screen. Even better, the app can hide the navigation bar so you win that extra screen space for your apps instead. It’s like getting a bigger screen without it being bigger.
Several basic gestures are available, including the obvious back, home, recent that you’d use the navigation bar for in the first place. You can unlock more gestures (even multi-touch ones) for 90 cents.
I’ve just started using this, and the added screen space is very nice. The app can even tell the difference between a short swipe (nav bar) and a long swipe (whatever app is in the foreground). It does take half a day to get used to but then you probably aren’t going to miss the original navigation bar ever again.