(And yes, that link can be used in your favorite downloading program to save it to your hard drive)
Enjoy!
(for those not brave enough to just click, that'd be the official Return of the King trailer from lordoftherings.net.)
UPDATE:
Or you can just go here and choose what size to watch or download. It's not like they hid it or anything...
UPDATE #2:
Ugh. For those who found the ZIP file I linked to corrupted (like I just did), you can download the full MOV file here. It's about 28MB, instead of the 17 the ZIP was, but at least it'll work....