An "augmented reality" attempt, mashing up the iPad Camera with a Map and using the compass/GPS to force the map to lock to your position.
The JS demonstration
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Ideally you have your own map service to add, if not checkout ArcGIS.com and search around for a service to try out.
Open the
MapCompassCameraViewController.m
and look for the
NSURL *netmapUrl = [NSURL URLWithString:@""];
and add your own resource URL.
This is a quick-and-dirty demonstration of a simple Augmented Reality app. It based this heavily off the original ArcGIS iOS GPS Sample.