Billboards on your dash could be coming thanks to in-car Internet

Two months ago, General Motors revealed a new deal with AT&T that would see the nation's largest automaker build in fast cellular data service into most of its models starting in 2015. Today, GM's chief executive supplied his view of what might be possible — including the idea that GM could sell Internet ads on its dashboards. Who knew the final frontier in advertising was so close at hand?

On a conference call with Wall Street analysts discussing its first-quarter earnings, GM Chief Executive Daniel Akerson, a former telecommunications executive, played up the potential of building 4G service into vehicles, which in theory could offer enough data bandwidth for everything from streaming ads to mobile video service: