I've been trying to wrap my head around the Apple iPad since it was announced a couple of weeks ago. From Apple's promotional video it seems they think the typical user will use it lying down on his couch with his knees up. Maybe. But maybe there's another place that would work well. I think a great place for an iPad is in your car, mounted on the passenger-side dashboard. In this case it basically becomes the über PND--maps from Google, turn by turn directions from any number of 3rd party vendors, and a whole slew of "what's nearby" apps like Geodelic, Aloqa, even plain old Google. And then of course you have the built in iPod app with music, audio books, podcasts and movies. Oh and you also have a web browser and email for anything else.
This is definitely not something you want to put anywhere near the driver, but for the rest of the passengers in the car it could be a great way to pass the time on long road trips. And with the bigger form factor than the iPhone, it would be a lot better-suited to the tasks above.