The bulk of my collection is PSX/PS2 games. I've sold back a lot of my Wii/PS3/360 games, so this is what I currently own. I have a thing for obscure titles. :)
SNES
FF Mystic Quest
Super Mario World
TMNT IV: Turtles in Time
Donkey Kong Country
Super Mario Kart
Yoshi's Island
Mickey's Mania
Super Mario All-Stars
Tiny Toon Adventures: Buster Busts Loose
Disney's Magical Quest starring Mickey Mouse
Game Boy
Pokemon Red
Kirby's Dream Land 2
Tetris
Game Boy Color
Lufia: The Legend Returns
GBA
Super Robot Wars: Original Generation
Tales of Phantasia
Tactics Ogre: Knight of Lodis
Fire Emblem: Blazing Sword
Fire Emblem: Sacred Stones
DS
Lunar: Dragon Song
Pokemon White
Pokemon SS
Pokemon Platinum
Radiant Historia
Atelier Annie
Valkyrie Profile: Covenant of the Plume
PS3
Heavy Rain
Atelier Rorona
Valkyria Chronicles
Xbox 360
Fallout 3
Fallout: New Vegas
Dragon Age Origins
Infinite Undiscovery
Lost Odyssey
Xbox
Shenmue II
Megaman Anniversary Collection
Crimson Sea
Gamecube
Baten Kaitos
Baten Kaitos: Origins
Tales of Symphonia
Megaman X: Command Mission
Skies of Arcadia
LoZ: Windwaker
Star Fox Assault
Evolution Worlds
Fire Emblem: Path of Radiance
Pokemon XD: Gale of Darkness
SSBM
Wii
Fatal Frame IV: Mask of the Lunar Eclipse
Arc Rise Fantasia
Fragile
Dreamcast
Shenmue
Marvel vs. Capcom 2
Sonic Adventure
PSX
Grandia
Tales of Destiny
Tales of Eternia
FF IX
FF VIII
FF VII
FF Tactics
Valkyrie Profile
Arc the Lad I, II, III
Lunar
Lunar 2
FF Origins
FF Anthology
FF Chronicles
Dew Prism/Threads of Fate
Dragon Quest VII
Breath of Fire III
Breath of Fire IV
Star Ocean: The Second Story
Chrono Cross
Xenogears
Gundam Battle Assault
Rhapsody: A Musical Adventure
Saga Frontier 2
Tear Ring Saga
Shin Megami Tensei II
Atelier Marie
Vandal Hearts
Vandal Hearts II
Tactics Ogre: Let Us Cling Together
Koudelka
Hoshigami
Metal Gear Solid
Kartia
Front Mission 3
Azure Dreams
Ogre Battle: March of the Black Queen
PS2
Tales of Rebirth
Tales of Legendia
Tales of Destiny 2
Tales of the Abyss
Wild ARMs 3, 4, 5
Wild ARMs: Alter Code F
Dark Cloud
Gran Turismo 3
Suikoden III, IV, V
FF X
Atelier Iris 1, 2, 3
Mana Khemia
Phantom Brave
Magna Carta: Tears of Blood
Y's: Ark of Napishtim
Rogue Galaxy
SMT: Digital Devil Saga 1,2
Persona 3
Persona 4
SMT: Nocturne
Grandia Xtreme
Grandia III
MS Saga: A New Dawn
Arc the Lad: Twilight of the Spirits
Shadow Hearts 1,2,3
Valkyrie Profile 2
Kingdom Hearts 1,2
Dragon Quest VIII
Legaia 2: Duel Saga
Shadow of the Colossus
Shining Force EXA
Stella Deus
Breath of Fire V: Dragon Quarter
Growlanser Generations
Growlanser V: Heritage of War
Ar Tonelico
Ar Tonelico II
Shining Tears
Silent Hill 2
Soul Calibur II
Star Ocean 3: Till the End of Time
Xenosaga I, II, II
Okage: Shadow King
Phantasy Star Universe
FF XII
Radiata Stories
Arc the Lad: End of Darkness
Silent Hill: Origins
Berwick Saga
Eternal Poison
Ephemeral Fantasia
Megaman X Collections
Megaman X7
Megaman X8
Ico
Sakura Wars V
Unlimited Saga
Silent Hill: Shattered Memories
Front Mission 4, 5
Silent Hill 4
Dual Hearts
Tsugunai: Atonement
Disgaea 1,2
Fatal Frame 1,2,3
Beyond Good & Evil
Baldur's Gate: Dark Alliance 1, 2
Forever Kingdom
Crimson Sea 2
Rule of Rose
Summoner 1, 2
Zone of the Enders 1,2
Steambot Chronicles
Shadow of Destiny
Haunting Ground
Metal Gear Solid 2
Devil Summoner 1,2
Wizardry: Tales of a Forsaken Land
Okami
Baroque
PSP
Crimson Gem Saga
Star Ocean 2
Riviera: The Promised Land
N64
LoZ: Majora's Mask
Ogre Battle 64
Luckily I have this listed somewhere else, so I just pasted it. ;)
Favorites:
Tactics Ogre - Most expensive game I've bought.
Ico - Paid a lot more for the PAL version because the NA cover is ugly, lol.
Least: None really. All of the games I don't like eventually end up being sold.