Get a Remote Control for Your Computer
Why should you have a usb-powered remote (like the one shown on the left) for your computer? There are a lot of reasons.
First, it combines the PowerPoint usefulness (and laser pointer) of this wireless presenter with the folds-into-your-laptop's-PCMCIA-Slot portability of a Mogo mouse.
Second, it has controls for Windows Media Center, meaning that you can sit far back from your big monitor and thumb through photos and videos, as well as do cool things like adjust the volume settings and close extraneous windows. Not bad for $30.