Imagine using your iphone as a remote control for your home theater system. That is exactly what this fellow did. He wrote the application for himself. Here are a few screen shots.

iphone remote control application

Notice how you can choose your sources.

Here is a snapshot of his ability to choose mp3 by jacket cover art! This is too cool!

iphone remote mp3

You can read the whole article about the iphone as a smart remote control here:

http://blog.case.edu/gps10/2009/01/18/iphone_home_theater_remote_control_project