MotionX GPS Drive ($2.99) or Google Maps (Free) - The iPhone has done a pretty good job of making other electronic devices obsolete, from stand alone music players to contact managers to e-mail clients. Add one more device to that list: Portable GPS devices. There are plenty of turn-by-turn navigation systems, including one offered by AT&T, but we like MotionX because it's inexpensive, offers spoken turn-by-turn directions and uses an immediate web search to ensure that you are getting the most up-to-date information on your destinations. The initial download is $2.99, which includes one month of turn-by-turn directions. Each additional month costs another three dollars, without a recurring monthly subscription, so you can pay for it only when you need it for that family vacation or road trip. If you find yourself using it all the time, you can step up to the annual plan for just $25. Another worthwhile option for navigation is the Google Maps app included with the iPhone. It packs a lot of info, including live traffic data, and it's already included on your phone. While Google Maps can give you directions, they are just not real-time, turn-by-turn ones.