Back to the Future: The first time-travel experiment with Einstein. Doc's all excited, then there's the flames going right through them, and he screams, "What did I tell you?!?!?! Eighty-eight miles per hour!!!" I still love that scene, and the original Johnny B. Goode sequence still makes me smile.
Edward Scissorhands: The final shots of Edward still alive, alone in his mansion, carving ice sculptures; the "snow" raining down on the town is an epic shot.
Spider-Man 3: The opening shot of the final battle, when Spidey swings toward the construction site, and the citizens start clapping. Adding the American flag was a nice touch, too. I also enjoyed the shot of Harry's arrival for the fight, and Sandman's "dust cloud" exit after telling Peter the truth about Uncle Ben's death.
Pirates of the Caribbean - Curse of the Black Pearl: Jack's grand, sinking entrance into Port Royal makes me laugh every time, and the reveal of Barbossa's crew as skeletons was excellently done.
Hulk: Bruce Banner's first two transformations are excellent. I hope the upcoming "reboot" with Edward Norton retains some of the visual styles from that film.
The Passion of the Christ: Just about every scene was marvelously shot. I still applaud Mel Gibson for being as faithful to Scripture as he was.
The Chronicles of Narnia - the Lion, the Witch, and the Wardrobe: Lucy's first entrance into a snow-covered Narnia, the final battle against Jadis, and the coronation ceremony were all incredible. Aslan was so real at times, I forgot he was entirely digital.
"The Lord of the Rings" Trilogy: Too many to name, but a few of my faves are the prologue, Bilbo's birthday party, Gandalf's fight with Saruman, Gollum's entrance in "The Two Towers", the fortress of Minas Tirith, the battle for Helm's Deep, and of course Mount Doom. Aragorn's coronation was great, too.