1. Pan's Labyrinth
2. Lord of the Rings: Fellowship of the Ring
3. Eternal Sunshine of the Spotless Mind
4. Memento
5. The Departed
6. Garden State
7. Kill Bill Vol. 1
8. Iron Man
9. Finding Nemo
10. V for Vendetta

1. Gigli
2. Swept Away
3. Glitter
4. The Cat In The Hat
5. Speed Racer
6. Catwoman
7. Lady In The Water
8. Little Nicky
9. House Of Wax
10. put in any Uwe Boll movie of your choice, they're all so good

I'm not falling for it.

Coming up with 10 was easy. Ordering was hard.

1) Punch Drunk Love
2) Adaptation
3) Oldboy
4) Hustle & Flow
5) The Royal Tenenbaums
6) Memento
7) The Incredibles
8) Almost Famous
9) City of God
10) The Departed

1. In the Mood for Love
2. George Washington
3. 2046
4. City of God
5. Werckmeister Harmonies
6. Mulholland Drive
7. The Assassination of Jesse James by the Coward Robert Ford
8. Last Life in the Universe
9. The Barbarian Invasions
10. Amores Perros

Russian Ark (Sokurov, 2002)
Eureka (Aoyama, 2000)
Millennium Mambo (Hou, 2001)
In the Mood for Love (Wong, 2000)
Werckmeister Harmonies (Tarr, 2000)
Last Life in the Universe (Ratanaruang, 2003)
Vertical Ray of the Sun (Tran, 2000)
Ten (Kiarostami, 2002)
Old Joy (Reichardt, 2006)
Mutual Appreciation (Bujalski, 2005)

I'm rock solid on my top 3:

1. Mulholland Drive
2. AI
3. The Pianist

They are the films that will be remembered and rewatched in 50 years. I view a top ten as a list of films that will still be of interest in the future. I have other favorites from this decade, but I really can't put them as a top 10, because I really can't trust that they will live on. By and large I think the decade has been pretty weak. I might also include:

Black Hawk Down
Tu Mama Tambien
History of Violence
24 Hour Party People
Punch Drunk Love
Donnie Darko
Lost in Translation

Here is a quick compilation in alphabetical order. Each spot goes to a different country (the exception being that I consider Hong Kong to be a filmmaking entity unto itself):

A.I. Artificial Intelligence (2001) (USA)

Colossal Youth (2006) (Portugal)

Eureka (2001) (Japan)

Goodbye Dragon Inn (2003) (Taiwan)

In the Mood for Love (2000) (Hong Kong)

Kings and Queen (2004) (France)

Still Life (2006) (China)

Syndromes and a Century (2006) (Thailand)

The Tracker (2002) (Australia)

Werckmeister Harmonies (2001) (Hungary)

Cache
The Piano Teacher
Mulholland Dr.
Bug
Spider
Dogville
Mysterious Skin
Eastern Promises
Keane
Inland Empire

Batman Begins
Iron Man
No Country For Old Men
Gone Baby Gone
The Departed
Memento
Kill Bill Vol. 1 & 2
LOTR Trilogy
Collateral
Children Of Men
X2
3:10 to Yuma
Spidey 2
Eastern Promises

Donnie Darko
Zodiac
The Assassination of Jesse James......
Snatch
Into the Wild
American Psycho
The Rules of Attraction
28 Days Later
Sunshine
Garden State

I really like your list. Here's mine:

1. Eternal Sunshine Of The Spotless Mind
2. Requiem For A Dream
3. Donnie Darko
4. Vanilla Sky
5. Memento
6. Garden State
7. Batman Begins
8. American Splendor
9. Walk The Line
10. Zodiac

Honorable Mention:
Across The Universe, Harry Potter And The Prisoner Of Azkaban, The Departed, The Prestige, The Fountain, Crouching Tiger, Hidden Dragon, Superbad, Little Miss Sunshine, Lord Of The Rings (all 3, though my favorite is The Return Of The King), Pirates Of The Caribbean (1), Almost Famous (Untitled version), Gangs Of New York, The Aviator.

It's been awhile since I've seen certain movies, so this list is ever-changing. I honestly still don't understand all the love for Children Of Men, but maybe I'll have to revisit it sometime when my expectations aren't so high.

K

Eternal Sunshine of the Spotless Mind

Shaun of the Dead

Batman Begins

The Departed

American Psycho

Zodiac

The Royal Tenenbaums

I like this list a lot. Of the films we've both seen, the only one I have mixed feelings about is A.I.

1. There Will Be Blood (2007)
2. Zodiac (2007)
3. 25th Hour (2002)
4. The Departed (2006)
5. King Kong (2005)
6. No Country for Old Men (2007)
7. Memento (2001)
8. United 93 (2006)
9. Requiem for a Dream (2000)
10. Traffic (2000)

I could go back and forth between #1 and #2 all day.

Great choice.

1) Zodiac
2) Memento
3) Finding Nemo
4) Mystic River
5) The Bourne Ultimatum
6) Unbreakable
7) The Passion of The Christ
8) Million Dollar Baby
9) Seabiscuit
10) Love, Actually

I feel the worst leaving off 25th Hour and Almost Famous. They would be the next two on my list, and probably would crack my top 10 depending on mood.