Please note these are my ranking only of films I've seen. Any films you think should be on this list may be due to the fact I've yet to watch them. I welcome any recommendations of films which should be included.
2. Good Night, and Good Luck.
3. Why We Fight
4. Star Wars: Episode III - Revenge of the Sith
6. Cinderella Man
7. Walk the Line
8. The Constant Gardener
9. Warm Springs
10. Riding Alone for Thousands of Miles
Honorable Mention - The 40 Year-Old Virgin, Batman Begins, Breakfast on Pluto, Brick, Broken Flowers, Charlie and the Chocolate Factory, The Death of Mr. Lazarescu, Everything is Illuminated, The Greatest Game Ever Played, A History of Violence, Hitch, Hustle & Flow, In Her Shoes, Inside Deep Throat, Jarhead, Kingdom of Heaven, King Kong, Kiss Kiss Bang Bang, Little Manhattan, Mad Hot Ballroom, The Matador, Match Point, Memoirs of a Geisha, Merry Christmas (Joyeux Noel), Pride & Prejudice, The Prize Winner of Defiance, Ohio, Revolver, Sin City, Sometimes in April, The Squid and the Whale, Syriana, Thank You for Smoking, Tim Burton's Corpse Bride, The Upside of Anger, V for Vendetta, Wallace & Gromit in The Curse of the Were-Rabbit, The World's Fastest Indian, Zathura
Noteworthy films I haven't seen yet - The 9th Company, Adams aebler, Barfuss, The Beat That My Heart Skipped, Beyond the Gates, A Bittersweet Life, Black, The Child (L'Enfant), C.R.A.Z.Y., Dave Chappelle's Block Party, The Devil's Rejects, Duma, El Aura, Enron: The Smartest Guys in the Room, Fateless, Gonul Yarasi (Lovelorn), Go See and Become, Green Street Hooligans, Grizzly Man, Into Great Silence, Junebug, Lackawanna Blues, The Last Hangman, Look Both Ways, The Lost City, The Magic of Ordinary Days, Manderlay, March of the Penguins, The Method, Murderball, My Father and My Son (Babam ve Oglum), The New World, Nine Lives, No Direction Home: Bob Dylan, Paha Maa, Paradise Now, Parineeta, Peacock, The Rising: Ballad of Mangal Pandey, Sarkar, Saw II, Sisterhood of the Traveling Pants, Sophie Scholl, Star Wreck: In the Pirkinning, Sympathy for Lady Vengeance, Transamerica, Water
Films I think are overrated: The Aristocrats, Brokeback Mountain, Cache, The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe, Coach Carter, The Descent, The Girl in the Cafe, The Great Raid, Harry Potter and the Goblet of Fire, Lord of War, Me and You and Everyone We Know, MirrorMask, Mrs. Henderson Presents, North Country, Proof, The Proposition, Rent, Serenity, The Three Burials of Melquiades Estrada, Unleashed, Waiting..., The Weather Man, Wedding Crashers