I have double twist now and it won't play them. I have seen the posts on converting to mp3 and removing the protection from video. Still looking for a one stop fix.
Google has yet to make an itunes equivalent...big flaw in my book. I'm sure they will some day (maybe when they come out with google music).
Just hook it up to your PC and grab it from your itunes library folder... it (the Xoom) plays the music and the videos perfectly with the stock player...
When I drag and drop from itunes library to music folder on xoom I get a message it might not play correctly on device but I let it copy over. It then is in the music folder as a mpeg4 (protected) and will not open.