If you have a new Mac and run OS X, you probably already use your Apple Remote for your photos, music and movies. But did you know you can use it for your Keynote presentations as well? While running Keynote, press play to begin the presentation, use the forward, or back, buttons to move between slides, and use the up and down buttons to raise or lower the volume. To put your computer to sleep, just hold down the play button. For a video demonstration for each of steps, watch this OS X tutorial.