From Lawyerist: "Trial Presentation with an iPad and Apple TV," by Kevin Morris--
Using an iPad for trial presentation is not only more efficient and economical than traditional presentations, it is also drop-dead easy to set up. Each and every piece of evidence is just a tap away, which means no more lugging around blown-up foam board exhibits or fiddling with unreliable overhead projectors.
As Morris writes, "As for setting up and presenting on an Apple TV, this article will teach you everything you need to know." The article covers equipment, set-up, and a comparison of three apps for trial presentation: TrialPad, ExhibitView 5, and Trial Director.