[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.]
12. Dodgeball (2004)
Not the full theatrical trailer, or the teaser for that matter. No, this was an internet promo trailer, but seeing as it's still one of the funniest things I've ever seen (and the thing that made me fall in love with Justin Long), I'm including it.
Awesome trailer attributes: Iconic performer
13. 28 Days Later (2003)
Perfect example of a great teaser, where glimpse after glimpse piles up in your mind and you end up seeing far more than you probably did. Then, in the last third, you get that tantalizing shot of Cillian Murphy alone in the middle of a deserted Picadilly Circus. Unexpectedly beautiful look at an unexpectedly beautiful (and terrifying) movie.
Awesome trailer attributes: teaser; creep-tastic; cool song/score