We have been using Movie Maker (on PCs) and Keynote (on iPads) to create simple, cinema-style movie trailers of books we have enjoyed. We have then showed these trailers to other classes around the school and in assemblies, and even published a couple on YouTube. Each trailer takes a couple of hours to plan, create and edit. We had to be aware of copyright issues with some of the images and music that we chose, but it's been a great way to motivate children to read more books (they can only make a trailer for a book they haven't previously read!).
Video trailer for The Thornthwaite Inheritance by Gareth P Jones