Check to see if you are "blocking popups", that has killed the video link for me in the past (at apple), but on the other hand they were having problems with those links working when they first tried to bring it online.

 Also try here;
http://www.movie-list.com/trailers.php?id=avatar

Even though movie-list has the same HD trailer from apple, it loads up in your browser instead of making Quicktime start up.

AS

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