This was inspired by a thread at Film Score Monthly's message board. The topic: Best scores of the decade (by year). (Okay, maybe it should say 'favorite scores', as best is subjective.) As usual, some of my choices are stranger than others:

2000
Chicken Run, Harry Gregson-Williams & John Powell
Hollow Man, Jerry Goldsmith
The Road to El Dorado, Hans Zimmer & John Powell
Terror Tract, Brian Tyler
Unbreakable, James Newton Howard

2001
Atlantis: the Lost Empire, James Newton Howard
Bubble Boy, John Ottman
Evolution, John Powell
Final Fantasy: the Spirits Within, Elliot Goldenthal
The Mexican, Alan Silvestri

2002
Big Trouble, James Newton Howard
Catch Me if You Can, John Williams
Lilo and Stitch, Alan Silvestri
Signs, James Newton Howard
Spirited Away, Joe Hisaishi

2003
Darkness Falls, Brian Tyler
Looney Tunes: Back in Action, Jerry Goldsmith
Matchstick Men, Hans Zimmer
Paycheck, John Powell
Willard, Shirley Walker

2004
Arsene Lupin, Debbie Wiseman
Hellboy, Marco Beltrami
Lemony Snicket's A Series of Unfortunate Events, Thomas Newman
The Punisher, Carlo Siliotto
The Terminal, John Williams

2005
Charlie and the Chocolate Factory, Danny Elfman
House of Wax, John Ottman
Kiss Kiss Bang Bang, John Ottman
Munich, John Williams
Racing Stripes, Mark Isham

2006
The Black Dahlia, Mark Isham
Casino Royale, David Arnold
Flushed Away, Harry Gregson-Williams
Inside Man, Terence Blanchard
Monster House, Douglas Pipes

2007
Enchanted, Alan Menken
Hot Fuzz, David Arnold
Live Free or Die Hard, Marco Beltrami
Meet the Robinsons, Danny Elfman
Ratatouille, Michael Giacchino

2008
Burn After Reading, Carter Burwell
In Bruges, Carter Burwell
Speed Racer, Michael Giacchino
The Spirit, David Newman
Wanted, Danny Elfman

2009*
Coraline, Bruno Coulais
Duplicity, James Newton Howard
The Informant!, Marvin Hamlisch
Public Enemies, Elliot Goldenthal
Up, Michael Giacchino

* - This list is purely provisional; the year isn't yet over.