By now, the illustrious “fourth screen†is a common term--that of the mobile device, still the holy grail for media companies and advertisers. At the North American International Auto show(NAIAS) in Detroit, it became clear that the era of the “fifth screen†is upon us: The one inside people’s vehicles. Unfortunately for consumers, these "mobile" systems tend to have substantial usability problems. Ford, once known for classics like the Mustang, Cobra and GT then emerging with the family-friendly (and dull) Taurus in the 1980s and the Explorer in the 1990s, is helping to lead the charge. It plans to make its MyFord...