Prezi is a great medium for presentations. My class used this last year when the entire grade was working on a state fair. Each group worked on a Prezi presentation together during their computer class. They were able to log on as a class and each make their own project. It is very user friendly and the kids really enjoyed making them. At the fair itself we had the Prezi App uploaded to all of our I-Pads and the kids were able to have an I-pad at their station so visitors could view their presentation.