The London Games are being billed as the first digital Olympics. Thanks to NBC, the sporting event will be available on TVs, mobile phones, desktops and tablets, both live streams and on-demand, for the next two weeks. The Games will also be the biggest test to date for TV Everywhere, the cable industry's three-year-old effort to bring cable programming to digital devices. TV Everywhere has not been adopted broadly by operators. If digital delivery of the Olympics proves popular with viewers, that may change.