TheOneRing.net has an extremely detailed analysis of the Return of the King trailer (which, as I mentioned earlier, can be downloaded here).

My favorite moments in the trailer — which I’ve watched, oh, 500 times so far :) — are the shot of Gandalf the White charging toward battle with Nazgul, his staff aglow…

…and the concluding shot of Sam Gamgee inside Mount Doom, his face illuminated by the Fire, screaming, “Nooo!”

In addition, there is a particularly wonderful Slinker/Stinker moment wherein, after Frodo defends Gollum against Sam’s accusations of murderous intent, Gollum looks back at Sam, and his sheepish, pitiful Smeagol facial expression turns ever so briefly into a wickedly evil Gollum grin. (Sorry, I don’t have any pictures of the transition. But trust me, it’s cool.)

I also like the fact that, during the Last Debate inside Minas Tirith (third frame down on this page), Gimli the Dwarf appears to be sitting on the seat of the late Steward of Gondor, smoking a pipe. Heh.

Oh, and let’s not forget Shelob’s big-screen debut:

How many days until December 17?!? :)