I personally would have to say the Balrog..

Shelob comes in as a close second I guess.

The Balrog rocks!

Armoured trolls kick some serious ass too.

Grond was cool - even though not alive.

I like those giant slow rhinocauros-looking creatures we saw in ROTK for only three seconds. My favorite, though, would have to be Gwahir and the rest of the eagles, them fighting with the fell beasts. I was looking forward to that scene from the very beginning and it looked awesome.

To be honest, my favorite creature had to be the Uruk-Hai. Those dudes were massive. And not just like big-massive, I'm talking, The Rock-massive. I swear, when that leader of the first band of Uruks yelled "Find the Half-Ling!" I peed just a little bit.

Uruk-Hais are good.But when he said Meat is back on the Menu, that's it.Balrog is the one I like.Second are the cave trolls

Balrog and Fell Beast. Have the Weta statues of each.

Gollum. Hard to think of him as a "creature", though. He just seems so real.

Second choice: The Cave Troll. The amount of characterization they put into that big lummox was just amazing.

Balrog then cave troll.

They are all great, I really liked the Naz-gul(sp?), especially after discovering their roar was created mostly from a donkey's screech, and the whoosh of their tail from a cheese grater spun around in the air. Any flying dragon creature made from donkeys & kitchen appliances is OK by me.

I love the DVD's for exactly that reason. I remember being so damn impressed by the fact that the Cave Troll's noises were really those of a pig and a dog combined. Now i don't think sound-techs are such uber-dorks....

Sauron.

the ring

Going with The Balrog here. Utterly massive, took my breath away when I first saw Fellowship in the theater.

Second would be the monster in the water outside of Moria.

Balrog then Fell Beast.

(HA! You expected me to say Old Toby didn't you?!)

Liv Tyler

Balrog

The Ents, though the armored trolls in the 3rd movie were cool too.

The Balrog was great. Almost makes me wish they would make a movie on Morgoth and his army of Balrogs. Dozens of Balrogs fighting Ungoliant, the mother of Shelob, to save Morgoth from the spider's webs would look great on screen.

oh. my. god.

I was wondering what would ever top the battle of pellinor fields.

Now I know.

Shame it will probably never be made, though.

Here is a brief description of what the battle looks like from the Sil:
Ungoliant is the ultimate bad-ass monster as per Tolkien's writing and even Morgoth was unable to restrain her. It took the collective power of Morgoth's Balrogs to chase her away. Shelob was the last child of Ungoliant to trouble middle earth.

^^
dying to see it filmed.

my fave is also the Balrog.

followed by the Ents, and then the trolls from the siege of Minas Tirith.

I don't know if this counts but the Witch King

if not, The Balrog

The Nazgul were made to look too weak and easily defeatable in the movie. Any time they meet Aragorn or Faramir or Arwen, they got the crap kicked out of them. The only time they did any damage was when they stabbed Frodo. In the war, it was their flying creatures that did the damage, not them.

The Ringwraith would do for me. Their scream is simply frightening.