The Remote is a simple yet awesome app. It can turn your laptop/desktop into a wireless media center. This means that you can start videos with the Remote, along with music. You browse your library like you normally would on you iPhone, and then once you select a song, play it as you normally would. But, the Remote will send a signal to your computer to play that song and you can listen to that song from your iPhone (it plays on the iPhone as well) or from your computer.
This is a great app in that it's free, it does something cool and useful, and you can scare friends with abnormally loud music as they walk by. Overall, download it, try it, and see how you like it. It's free, so don't be afraid to delete it if you don't like it.