Blu-ray and HD-DVD are always letterboxed!
That is to say: there are no anamorphic formats defined, which means that no movie wider than 16:9 ratio can use the full resolution of 1080. They must always be letterboxed, encoding the black bars as part of the signal (albeit highly compressed).
This is a bit ridiculous, IMO, since this means you will rarely if ever get 1080 lines of actual signal even though it's in "1080p". For the moment it's not a problem as it's still an advance over DVD, but not as much as it should have been.
For more discussion:
http://www.avsforum.com/avs-vb/archive/index.php/t-652716.html
(site seems to be down at the moment).
For a description of this proposed "Super-Cheap" HD version of OOT, we should think up something more accurate... like "Blur-Ray"
