Sorry, Elfstone, I thought it was time to expand. :D I also hated to keep the TTT scenes bottled up for fear of drifting too far OT as I can be long winded (and I can hear the collective, sarcastic: "NO! You're kidding, long winded, you?" ;) )
And Grondy, thanks for reminding me, I almost forgot about Aragorn's swimming/near death/brought back by Arwen sequence. I agree, completely unneeded.
The Elves at HD, I liked the "touching" feeling that PJ developed for the scene when the Elves came to assist the humans, however that destroys Tolkien's whole point in that the Elves and Men and Dwarves could not ally under one flag because each race was coming under attack and had to defend their homes. It also undermined Tolkien's vision that the overall war was Men's last chance to redeem themselves and take over dominance of Earth from the Elves who were leaving anyway. That said, I would still keep it, although would want Haldir to live and some of the elves survive and go on to ROTK with Aragorn and crew. This way it would more closely resemble the book where Aragorn's fellow rangers and (two of?) Elrond's Sons find him and bring him the message on the way he should go to Minas Tirith in the ROTK. Or, a better alternative would have been to have the elves and rangers fight at HD, the elves taking the brunt of the casualties and those survivors moving on with Aragorn in ROTK per the book. That would also make a larger impression in the next movie when that crew separate from the Rohirrim on the way to Minas Tirith. (Note: Tryin' not to give too much away to those who may not have either read ROTK or seen the movie, yet while at the same time not trying to drift to a different topic).
Back to my original biach against TTT, I believe that PJ left too much of Frodo's journey for ROTK by having him go to Osgilliath. I believe it would have made for a better movie ending to have Frodo put to sleep by Shelob and captured by the orcs at (darn, can't remember the name, brain fart!). It would be like the old silent movies with the cliff hangars to lure you back to see what happens "next week". Afterall, everyone knew that PJ made three movies and that the first was a complete smash hit and the second was all but going to be as well, so it would not have been out of line, IMHO, to leave movie two with the cliffhangar. It also would have freed up ROTK from having to do what I felt was a "quick and dirty" cleanup of the events from movie two before moving on to the rest of movie 3, but that is my biach for the ROTK "what would you change" thread, when it finally comes into being.