“The iPad is the must-carry accessory on sound stages this season, visible behind the scenes of television and film shoots and in business meetings. When Paula Abdul, the former “American Idol” judge, wants to preview her new dance show for prospective sponsors, she turns on her iPad and pulls up a YouTube video. When Julie Benz, a star of “No Ordinary Family” on ABC, has downtime between shoots, she plays Angry Birds, the popular physics-based puzzle game.”

