It's possible to add video clips to presentations as well as photos. To do this, first select the slide where you would like the movie to appear. If all the slides are already full of photos, press the Ctrl and M keys together to add a new one. In Powerpoint 2003, click Insert, Movies and Sounds, then Movie from file; then select a video clip from your hard disk. In Powerpoint 2007, click the Movie button on the Insert tab, then choose a file. In both cases you'll be asked whether the video clip should start playing automatically, or wait until it is clicked. Choose one, and the clip will appear on the slide.