I've tested Handbrake and DVD Catalyst 4 (with several recommendation from other posts on settings) to encode movies in 720P format and all of them seem to have this slight choppy effect. The choppy effect seems to show up more on fast motion video (action movies). I tested the video on a computer to make sure it was not the video itself and it plays very smooth on my computer. At this point, I assume that there is no optimized video player (QQplayer, Rockplayer, or Movies player within the gallery) that works with the Xoom hardware. So has anyone tested HD video playback on an overclocked Xoom to see if it works any better for HD video playback?