There is also a lot your remote can do without additional software. From
http://gnuhaus.com/iblog/archives/000200.html
Click any button on the remote to wake your Mac from Sleep
Control the volume of your Mac with the +/- buttons
Control your QuickTime Movies, including Play, Pause, Fast Forward, Rewind, and Skip to the Beginning; Pause the movie and click the Next button to step through the movie frame by frame
Control DVD playback
Use the Next and Previous buttons to control slides in Keynote
Use the Next and Previous buttons to move between songs in iTunes; Play and Pause songs with the Play button
Next and Previous buttons move you through the Source pane in iPhoto.
Click the Play button to start a slide show using that source; click again to pause the slide show, and the Next and Previous buttons will move to the next or previous slide; Click the Menu button to exit the slide show
Click and hold the Play button and a snoring image of the remote will appear on screen. Continue holding the Play button and your Mac will go to sleep