MotionX GPS Drive App
first GPS iPad app I've bought, so far so great. hard to beat for $2.99. 3 months of turn-by-turn voice directions for free, then something like $30-40 a year after that. great built-in ipod controls, OK mapping (it's powered by Bing Maps, but I prefer Google Maps) and an all-round great way to use your iPad in the car.