Apple has released an update for the Apple TV digital media receiver, bringing the firmware up to version 2.3. The patch is available solely through the device's built-in update feature and consists of four main improvements, key among which is the ability to stream music from the media device to either other Apple TV units or Airport Express speakers.
Apple has also added the ability to use third-party remote controls with Apple TV. You can still use the official remote, and of course, if you have an iPhone there is an excellent Apple-provided Remote application as well. Finally, the two remaining new features include the option for playlists that contain a mixture of various audio and video formats as well as the ability to adjust volume in the music section.
It is important to note that as with all other Apple TV firmware updates, running the update will remove any non-Apple TV software as well as unofficial hacks or tweaks made to the device.