Plex has shipped an app for the new Apple TV App Store. The software allows you to control and access your Plex Media Server from your Apple TV—for those who don't already know, Plex Media Server allows you to control a wide variety of media files from disparate sources including networked storage devices. The app is a free download, but it requires a Plex Media Server to actually do anything. There are in-app purchases for premium services, as well. You can either search for the app on your Apple TV's App Store (for new Apple TV models). If you have already downloaded the Plex app for iPhone or iPad, you can find it in your purchase history on your Apple TV.
Check It Out: Plex App Arrives for Apple TV