I put this PPT together for my students to use as last-minute revision. The first slide has lots of balloons that link to a slide on the topic written in each balloon. Slides have a 'back' button to take you back to the main slide. If there is no back button, there is more than one slide for that topic. I'm going to email it out to my students or give it to those that have a USB stick. It could easily be used as a whole-class revision tool. I made this in MS PowerPoint 2010 and saved it as a 97-2003 Presentation so it should work in earlier versions. I haven't tested it though.