IMO, handhelds just make more sense than an embedded system.

Agreed. Especially if rented in the airport for the duration of the flight and/or trip.

Time spent in the airport before and after each flight clould be spent with our eVU.

If the eVU was rented for the duration of the trip, lots of hotel and poolside time could be used to catch up on the latest movies and provide advertizing opps for local businesses.