Howdy! I'm learning how to build iPhone apps, and I recently put together an app for Disneyland and Walt Disney World called Magic Map. It uses the GPS to find the nearest rides, dining, even restrooms, and the compass to point the way to them.
As you move and turn, the arrows rotate to stay pointing at their waypoints.
I tried to keep it pretty simple to start with, so it doesn't include wait times or any other extra information, but I'm going to keep working on improving it and adding features.
What would you like to see?