I was finally able to sample how a 1080i and 720p video looks when imported/exported to AppleTV's 540p. I only tried a 1 minute clip. The 540p resolution did take a bit of the wow factor. I'll have to try some more tests, with different clips. Anyone try Popcorn Hour as an AppleTV alternative? I don't plan on streaming the video so I don't need to worry so much about file size and bitrate that is associated with AppleTV's non adjustable iMovie export.