What can I say that hasn't already been said ? This was an absolutely fantastic film, a perfect end to the greatest film trilogy of all time.
I would just like to draw attention to Sean Astin in the role of Samwise Gamgee. His acting was incredible, it was a crime that he didn't even receive a nomination for best supporting actor. Sam was the heart of the trilogy, and he really came into his own in this, the final part.
One of his finest moments, in my opinion, was whilst on Mount Doom, Frodo unable to go on, Sam says "I can't carry it for you, but I can carry you". This, coupled with Howard Shore's incredible music, was one of the most powerful cinematic experiences I have ever had.
The second moment, which whilst not in the book, worked to an unbelieveable effect in the film, was when Frodo was clutching the edge of the cliff over the fires of Mount Doom. With the folorn look on his face, Frodo looks upwards at Sam. Sam grabs hold of Frodo's wrist, and shouts "Don't you let go." This was equally, if not more, powerful than the 'carrying' scene.
And then we have the scenes after - Frodo and Sam on the rock, in the middle of a lava flow. Sam's crying over Rosie was incredibly moving, and Frodo's comment to Sam did as I predicted it would, which was tear me up inside - "I'm glad to be with you, Samwise Gamgee ... here, at the end of all things."
This film needs no more recommendation.