Why would you want to use your Apple iPad in the car? There are a lot of reasons. Best one is that it makes a great GPS. Many of the GPS apps from your iPhone will also work on the iPad. We like the MotionX GPS Drive app. Low cost and full features. When used on your iPad, you have one of the largest and crisp GPS displays made!
We also like it for back seat passengers. Movies are great on the iPad. Coupled with the Netflix streaming feature, watch movies or TV shows. You can also read the paper, do a book, and soon, live TV.