The Apple TV's homepage is getting pretty full, especially with today's addition of HBO Go, WatchESPN, Sky News, Crunchyroll, and Qello. Like the iPhone and iPad, you can't delete Apple's core apps from Apple TV, but unlike its portable iOS brethren, you can easily hide them.
If you go to Settings > General > Parental Controls and scroll down, every built-in app is listed. Click each one to toggle whether it is shown or hidden.
Bonus tip: You can reorder non-iTunes apps to make your favorite ones more accessible. Just click-and-hold the middle select button on an Apple Remote and they'll start slowly jiggling, much like moving apps on iOS. Use the remote's directional buttons to place each app where you like.
[via Tom Reestman]