[On a formatting note: I've tried to both embed the trailers (where possible) and link to the trailers someplace where I know they won't be pulled. If there's no embed, blame YouTube. Just click the link on the movie's title and you'll get it.]
2. The Devil Wears Prada (2006)
Justifiably praised for its high-concept-via-low-concept strategy of simply presenting one scene, in full, that completely lays out the movie without voiceover, text, or really much of anything. It's a great baiting strategy -- HA! You've already started watching! Gotta see how it pans out!
Awesome trailer attributes: teaser; iconic performance
7. Hero (2004)
Excoriate me if you must for including the American trailer over the other foreign clips, but if we're talking about the most effective trailers of the decade, and I am, selling the foreign-language Hero to the American masses is the accomplishment I want to applaud. Points taken off for the voice-over, but from that first hail of arrows this became an American action epic. Well sold. I'm even cool with the "Quentin Tarantino presents" part; tickets is tickets.
Awesome trailer attributes: misdirection
Click here for more Low Res Trailer Tournament polls.