Well, bought the HD-DVD addon last week. Only watched a couple movies (parts of King Kong and World Trade Center) but am so far impressed with the picture quality. KK looked the same as the showing on HBO-HD I saw a couple months back. What's nice is I can rent HD DVDs from Blockbuster.com without any addt'l charges.

I know this is an audio forum but I haven't really had a chance to give it a workout (have a new 1mo old, so no "ref levels" for me for a while). I'm not too up on the new audio formats, but from what I know, without HDMI or analog outs (I think the add-on converts all audio to DD via optical) cannot get full resolution of DD+, TrueHD, etc. Please correct me if I'm wrong.

Just thought I'd throw it out there for someone interested in dabbling in one of the HD formats w/o spending an arm or leg (that is, assuming you already have the xbox360).