Apple has quietly released a new software update to the Apple TV which brings the system software up to version 2.4. The exact changes have not yet been listed by Apple so we can't tell you everything that's been changed just yet. Apple typically updates this support document with the latest changes. The last update was the 2.3.1 update from February 2009.
One particularly notable feature however appears to be support for the newest version of Apple's Remote app [Free] which adds gesture support for controlling your Apple TV.
Apple TV's menu options can now be navigated with simple flick gestures. Similarly Video and Audio have new flick gestures that can be used to advance, rewind and replay. See the screenshots above.
Article Link: Apple TV 2.4 Update Now Available, Updated Remote App with Gestures