Our resident trailer expert, Christopher Stipp, has already written up a great "Top 10 Trailers of 2010" post over at /Film, but I thought I should share a few of my own. Here they are in no particular order:
Inception - Somehow they manage to cram in the most important exposition into this thing while still making time f-BRRRRRRRAAAAAAHM.
TRON: Legacy - I must've watched this trailer one or two dozen times. Ahh, to go back to a time when this movie had the possibility of being good....
Red State - Say what you will about the controversy over Smith's latest film, but this trailer is minimalist and masterful.
Battle: Los Angeles - I was speechless after watching this thing. Fantastic use of music and olde style photographic imagery.
True Grit - Gorgeous. And the Coen brothers really know how to use choral music in their films (see: O Brother for further examples).
The Social Network - Obviously.
The Tree of Life - I judge trailers by how well they sear a piece of music into my soul. By this standard, Tree of Life wins top honors for its use of Smetana's Vltava.
Transformers: The Dark of the Moon - The movie has a good chance of sucking horribly, but only Michael Bay can retcon the moon landing and make it so compelling, you forget for a moment that what you're watching is ridiculous.