Definitely interesting. The real question is whether Apple has come up with an easy way to share iTunes files between apps. Right now, I've got a big G4 tower in the office. If I could buy a Mac Mini to use as a DVD player and everything else, that would be attractive, but I'd want them to be able to share my music files (most likely, mounted from my file server). Let's hope some kind of multi-machine-sharing is part of the story.

EDIT: Apple has now updated their web site, with some screenshots of FrontRow and the cute remote control, which seems to be all about being a part of the new iMac G5. It's entirely unclear if there's a Mac Mini variant on this.