It always ticks me off when movie trailers try to forbid you from saving them to disk. So here's what I did with the most recent Harry Potter Goblet of Fire trailer on the Mac. It's probably not the best or most efficient way, but it worked. And I got my copy of the trailer.
I started by pointing my browser to the Moviefone exclusive. Once the trailer fully loaded, I did a View > View Source to peek at the page's underlying HTML. A quick look-see revealed the direct link to the movie's URL.
Next, I launched Terminal and used curl to retrieve the file.
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I've included a direct link at the end of this post to save you the bother. Enjoy. It looks like it will be a great movie.
Goblet Of Fire Trailer [QuickTime, Mov]