Are there any "demo discs" out there? I know that you can find all sorts of demo DVDs (I actually have around 30 different demo DVDs) but what about ones for HD-DVD? I've seen a DTS-HD Master Audio disc on fleaBay, but didn't know if there was something that just shows the WOW of high def? I heard that Toshiba started bundling one with some laptop a couple of weeks ago, but haven't actually seen one anywhere that I could pick up.