• The Diving Bell And The Butterfly
• No Country For Old Men
• Zodiac
• There Will Be Blood
• Sunshine
• The Darjeeling Limited
• The King of Kong: A Fistful of Quarters
• Sweeney Todd
• Once
• Ratatouille
• Juno
• The Orphanage
• The Host
• Knocked Up
• Superbad
• Eagle vs. Shark
• The Assassination of Jesse James by the Coward Robert Ford
• Persepolis
• The Lookout
• Enchanted

(The Host was in a festival in 2006 but had its actual release in 2007)

Honorable Mention: Children of Men (which could be considered a 2007 movie for people in the United States, but I'll call it a 2006 movie.)