pptPlex from Microsoft Office Labs 1.1Free
pptPlex is an Office Labs experiment that uses Plex technology to give you the power to zoom in and out of slide sections and move directly between slides that are not sequential in your presentation. Although this project is no longer being developed or supported, based on popular demand, the download is available for anyone who might have missed it.
pptPlex is a research prototype developed as an exploration of an alternative method of presenting Microsoft Office PowerPoint slides. This plug-in allows you to arrange slides on a canvas then zoom between the slides during the presentation. You can move around the canvas and show groups of slides, individual slides, or even zoom in to show a particular section of a slide. pptPlex can help you organize and present information in a non-linear fashion.