We did it for GameCube and Xbox and we'll have a running list going there for as long as we're alive, so here's the PS2 version. These threads should be especially handy to people who got their systems recently and want to start out with the "A List" of games to pick from.

So let's start the "A List". What would you add to it?

NOTE: * = exclusive to this system (for now)

Activision Anthology *
Amplitude *
ATV Off-Road Fury 2
Baldur's Gate Dark Alliance (series)
Beyond Good and Evil
Burnout 3
Capcom vs SNK 2
Champions of Norrath (series) *
Contra *
Dark Cloud 2 *
DDR Max (series)
Devil May Cry *
Disaster Report *
Disgaea *
Dragon Quarter: Breath of Fire V
Dynasty Tactics (series)
Dynasty Warriors (series)
Escape From Monkey Island *
(ESPN) Major League Baseball 2k5
Everblue 2 *
Final Fantasy X *
Frequency *
Gitaroo Man *
God of War *
Gran Turismo (series) *
Grand Theft Auto III
Grand Theft Auto Vice City
Guilty Gear X (series)
I-Ninja
Ico *
Jak and Daxter (series) *
Katamari Damacy *
Kessen II *
Killzone *
Kingdom Hearts *
Madden (series)
Marvel vs Capcom 2
Maximo (series) *
Medal of Honor: Frontline
Mega Man Anniversary Collection
Metal Gear Solid 2
Midway Arcade Treasures (series)
Mortal Kombat Deadly Alliance
Mortal Kombat Deception
MVP Baseball 2004
Namco Museum
NBA Street
Need for Speed: Hot Pursuit 2
Onimusha 3
PaRappa the Rapper 2 *
Phantom Brave *
Prince of Persia (series)
R-Type Final
Ratchet & Clank (series) *
Red Faction II
Rez
Ring of Red *
Shadow Hearts (series) *
Shadow of Colossus *
Shadow of Destiny
Shin Megami Tensei *
Silent Hill (series)
Sly Cooper (series) *
SOCOM (series) *
SSX Tricky
Star Ocean 3 *
Star Wars: Battlefront
Street Fighter Anniversary Collection
Suikoden III and IV *
Tekken 4
Tekken Tag Tournament *
Timesplitters 2
Tony Hawk (series)
Twisted Metal Black *
Virtua Fighter 4
War of the Monsters *
Wild Arms 3 *
Xenosaga *
Zone of the Enders (series) *