Overscan compensation on Apple TV app
The edges of the video in the the Apple TV version of NSScreencast are cropped and not visible on HDTV's with overscan. This hides the apple menu and status bars, and is generally disorienting. The newer version of the AppleTV doesn't compensate for Overscan on its own, and leaves it to the apps. This generally doesn't matter for video apps other than screencasts, of course.
Perhaps you can add an option to scale the video down by 1% or 3% and recenter it so that the whole screen is visible to we users over older HDTVs.