Controlling my iPod from my Mac

Hey guys, first post here, because I wanted to ask you about an app that you install on your mac (and iPod too?) that makes it possible for you to:

Take control over your iPod from your Mac via bluetooth and/or a network.
Is there such an app on the market? Cus, it does excist apps that does the opposite; Controlling your mac from your iPod.

Thanks a bunch!
martin.