PowerPoint is a nice tool if you are doing a presentation in front of an audience, but there are tricks in this program that let you use it for other things as well.
Movie Anyone: you can save your PowerPoint project as a movie. This would then be a self-running movie that uses QuickTime to run.
Build a Web Page: you can also save your PowerPoint as a web page. This is not ideal...the format doesn't always transfer well, but experiment with it. You might find something that works for you.
Use a Slide as a Picture: You can save each individual slide as an image. This works well if you are creating a video in iMovie and want to incorporate some PowerPoint slides.
Animation: If you use custom animation on a slide, you can save that out as a gif file and preserve your actions.
There is a lot you can do with PowerPoint, outside of PowerPoint. Experiment and see what the possibilities are.