Thanks for the reply from both weasel and 07crush. If Ford can't fix this under warranty, I at least have a starting point.
7/22/2010 Update:
Turned out that a connector behind the tailgate cover had come loose. Mystery as to how that happened remains.
Derek,
I have no license plate lights. I have changed out the bulbs with no luck. Does your manual tell what fuse/circuit these are under? There doesn't appear to be anything else NOT working.
Thanks, John