I have always disliked the Apple remote for the Apple TV and for Front Row. It’s simple, but sometimes you just want more. The new remote app that you can install on your iPhone/Touch is a godsend and is pretty cool. From your device you can start off a song, tell it to play on your Mac and then when you move into the kitchen to cook dinner you tell it to play the song over the the AppleTV! It’s completely seamless and you can move around the house putting different music on different devices. So imagine having several Airtunes and putting music in different places. Galleries will love this to set moods in different areas with different art.
So far I’ve used it to serenade my wife as a surprise before I told her about the feature.