This is due to be posted on the Official Lord of the Rings site sometime today, but I managed to snag this one of many mirrors that is up. The Return of the King trailer (to download it, right-click on the link and choose Save Target As …).
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Download the trailer (or stream it) at http://www.lordoftherings.net. Interestingly, the official trailer has the same content than the one I found, and is even the same resolution, but is about 6 MB larger in size. There may be differences in sound quality or compression.
Check this out.