I have the 23" HD cinema display, yet when I play a DVD (Finding Nemo in this case) it plays with the quality of a DVD on a computer. I read that it can play HD movies made in DVD Studio Pro (later burned to DVD), but why not a regular movie? Computer is a dual 2.3 G5. It's not a big deal since I normally watch them at minimum sized in the corner while I work. But it'd be nice.