Exiled Poet
Ungoliath
I'm glad there is still Tolkien fans on the Internet.
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And yeah, Ancalagon was more powerful than Smaug, but it didn't have half of latter charisma. I still prefer Glaurung because its story is better.
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Oh, yeah, the story surrounding Glaurung is definitely one of my favorite parts, and really detailed and wonderful. Ancalagon only got... what, a few sentences? But I just can't deny a flying ship and the great eagles taking on a fearsome black dragon. whee Honestly, it's the parts of the story that are the least detailed, that are so interesting, because your imagination can run wild with it. xD
And yes, Tolkien ftw. x3
Oh and I thought of another dragon that should be on the poll.
Draco in the movie Dragonheart, voiced by effing Sean Connery.
Edit:
I see Ralph mentioned that. xD
Only wanted to add one dragon per IP and Smaug is definitely the most popular dragon from Tolkien literature. And yes, Draco would've been a decent choice too (personally, I'm not a big fan of talking dragons.. esp. one with a Scottish accent), but my favorite dragon film is "Dragon Slayer" from the early 80s. That film still holds up today.
Dungeons and Dragons movie had some cool dragons in it too. And even though that movie totally failed (poor Jeremy Irons.. loved him as Scar in Lion King >> )... the CG fight sequences of the dragons were well choreographed and animated.