I've got my DNX7200 all hooked up, and here are just a couple of comments (if anyone is interested):
1. Judb is right (as usual), the interface with the keg does not allow for the display of album art. What is more surprising is that despite having more than enough space on the DNX visual interface, it will only display a maximum of two lines of tags from DMS tracks. So, you can have artist + track, or album + track, but you cannot have artist + album + track (as you can with the iPod). Of course, I could play around with the tags in PMM to display all the info I want, but still...
2. S80_UK also makes a very good point. A huge advantage that the keg has over the iPod is VIOT. I was hasty in my comments, and will be sticking with the keg for now -- especially as I have now found Western Digital makes an 2.5" ATA 250GB hard drive. Take THAT, iPod.
3. Minor quibbles aside, the DNX7200/7100 is awesome. Keg for music, iPod (or DVD) for video, Garmin navigation, plus I added a bluetooth module for hands-free phone operation, and it is all nicely integrated. If it could rub my shoulders while I drive, I would marry it.