Wow, this is fun.
I can control my iTunes application on my PC and listen to my favourite tracks, search, change the volume, pause, listen to Albums, Podcats, Playlists all via my Apple iPhone.
Download the FREE app from the App Store called "Remote" and then connect to your Library remotely.
Within seconds you will be able to crank up your speakers and listen to any of your iTunes Library via the phone.
I can see this developing so with blue tooth speakers downstairs I can easily listen to my favourite music via the iPhone, Awesome !!!