With the release of the iPhone 2.0 software on July 11th, the doors have opened for many creative and useful applications to change the way we use our iPhones (or iPod touch).
First out of the gate to show how to do a revolutionary application is Apple with their iTunes control software, Remote.
Remote turns your iPhone or iPod touch into a wireless controller for your computer. It works with v7.7 of iTunes on both Windows and OS X, and requires that iTunes be running. However, it does not require that you share your library. I imagine using Remote while having your computer connected to a TV or speaker system, and controlling the music selection from the iPod. The system also has a “check this out” factor, as it is kind of weird changing the song from anywhere in the house.