My friend Lukas just pointed me at this app that works with my phone and my computer called Clicker. From the readme:

Welcome to the first preview release of Sony Ericsson Clicker! Clicker lets you remotely control your Macintosh from a compatible Sony Ericsson phone. Here are some ideas on how to use Clicker:

• Control PowerPoint or Keynote when giving presentations.
• Control DVD Player or iTunes from your sofa or bed.
• Use AppleScript to control anything you like!

Further, Sony Ericsson Clicker has a built in "proximity sensor", allowing you to trigger actions when you leave or come back to your Mac. Again, here are some ideas:

• Pause iTunes when you leave the room, turn it on when you come back.
• Use AppleScript to let your presence (or absence) control anything you like!

This is too damn cool.