Uh... I've probably forgotten like half of the games I own, but I'll give it a shot...
N64:
Star Wars: Rogue Squadron
Star Wars Episode I Podracer
Star Wars SotE
Legend of Zelda Ocarina of Time
Legend of Zelda Majora's Mask
Tarzan
Lego Racer
Star Fox 64 (like one of the best games evaaaah)
Kirby and the Crystal Shards
Super Smash Brothers
Super Mario 64
Mario Party 2
Mario Kart 64
Pokemon Stadium 2
Pokemon Puzzle League
Hotwheels (at least, I *think* I owned that...)
Neon Genesis Evangelion 64
Gameboy Color
Pokemon Red
Pokemon Blue
Pokemon Yellow
Pokemon Gold
Pokemon Silver
Pokemon Crystal
Yu-Gi-Oh
Scooby Doo
Pinball Madness
Legend of Zelda Oracle of Ages
Legend of Zelda Oracle of Seasons (I loved those two games to no end)
Harry Potter and the Sorcerer's Stone
Kirby's Dream Land
Nintendo Gamecube:
Star Wars: Rogue Squadron: Rogue Leader
Super Smash Brothers Melee
Kirby Air Ride
F-Zero GX
Metroid Prime
Pikmin
Pikmin 2
Star Wars: Rogue Squadron: Rebel Strike
Sonic Adventure 2: Battle
Sonic Adventure DX (I looooooove Sonic games
)
Legend of Zelda OoT & OoT Master Edition
Legend of Zelda Wind Waker
Pokemon Colosseum
Pokemon Colosseum XD Gales of Darkness
Super Mario Sunshine
Luigi's Mansion
Mario Party 4
James Bond: From Russia With Love
Star Fox Adventures
Star Fox Assault
Yu-Gi-Oh The Falsebound Kingdom
Fire Emblem Path of Radiance
Harvest Moon A Wonderful Life
Animal Crossing
Sonic Mega collection
Sonic Heroes
Shadow the Hedgehog
Viewtiful Joe
Legend of Zelda 4 Sword Adventures
Sonic Riders
Mario Kart Double Dash
Final Fantasy Crystal Chronicles
Lord of the Rings Two Towers
Lord of the Rings Return of the King
Tales of Symphonia (THIS IS THE BEST GAME FOR THE SYSTEM EVAAAAAH!!! I beat it in 2 days because I was obsessed)
Gameboy Advance (this could turn out to be the longest one...)
Pokemon Ruby
Pokemon Sapphire
Pokemon Emerald
Pokemon Red Fire
Pokemon Leaf Green
Megaman Battle Network 1
Megaman Battle Network 2
Megaman Battle Network 3 (White)
Megaman Battle Network 3 (Blue)
Megaman Battle Network 4 Blue Moon
Megaman Battle Network 4 Red Sun
Megaman Battle Network 5 Team Protoman
Megaman Battle Network 6 Falzar
Megaman Battle Network 6 Gregar
Legend of Zelda: Link to the Past/Four Swords
Legend of Zelda: Minish Cap
NES Series Legend of Zelda I
NES Series Legend of Zelda II
Phantasy Star Collection
Golden Sun
Golden Sun Lost Age (OMG Those two were the best GBA games EVER!!!)
Fire Emblem
Fire Emblem: Sacred Stones
Harvest Moon: Friends of Mineral Town
Final Fantasy Tactics Advance (This had to be another amazing game)
GBA Card Reader
Yu-Gi-Oh The Sacred Cards
Sonic Advance
Mario Pinball
Advance Wars
Advance Wars Black Hole Rising
Kirby Nightmare in Dreamland
Kingdom Hearts Chain of Memories
Nintendo Wii (There really haven't been that many games for the Wii that I want... Nintendo's sorta starting to go downhill, much to my dismay
)
Metroid Prime 3 Corruption
Legend of Zelda: Twilight Princess
Rockband
Rockband 2
Guitar Hero 3
Fire Emblem: Radiant Dawn
Super Smash Brothers Brawl
Sonic and the Secret Rings
Super Mario Galaxy
Tales of Symphonia: Dawn of the new World (I LOOOOVE THIS SERIES!)
Nintendo DS
Metroid Prime Hunters
Super Mario 64 DS
Mario Kart DS
Fire Emblem Shadow Dragon
Final Fantasy Tactics A2
Final Fantasy III
Final Fantasy IV
Final Fantasy Crystal Chronicles Echoes of Time (I looooooove this game)
Star Fox Command
Advance Wars: Dual Strike (Loved that game)
Luminous Arc
Animal Crossing Wild World
Brain Age
Ryuusei no Rockman Dragon (Even though I have this and the following 2 in English, I'll still list in the Japanese name)
Ryuusei no Rockman 2 ZerkerXNinja
Ryuusei no Rockman 3 Black Ace (rather, I
will have this one)
Nintendogs
Megaman ZX
Kingdom Hearts 358/2 Days (I'm gonna get this one soon too)
Kirby: Squeak Squad
Kirby and the Canvas Curse
Pokemon Diamond
Pokemon Pearl
Pokemon Ranger
Trace Memory (I loved the music and plot in this game...)
PS2
Kingdom Hearts
XBox 360
Halo 3
Fable 2
Sonic the Hedgehog
PC (I'm listing all the games I've ever had)
Neon Genesis Evangelion Girlfriend of Steel
Myst
Riven
Muppet Treasure Island
Monopoly
Mario's Game Gallery
Halo Combat Evolved/Custom Edition
Star Wars Gungan Frontier
Star Wars KotOR
Harry Potter and the Sorcerer's Stone
Age of Empires I Gold
Age of Empires II Gold
Age of Empires III (All expansions)
Age of Mythology/Titans Expansion
Rise of Nations
Guild Wars (All campaigns and EotN. I have 2 of Prophecies 'cause I didn't join it and Factions at first, then started adding the others to factions)
WoW (I quit that though, so it kinda doesn't count...)
GTA IV
Spore (With all current expansions)
Civ IV
Half Life 2
HL2 Ep 1
HL2 Ep 2
HL2 Lost Coast
HL2 Deathmatch
Portal
GMod
CS:S
L4D
Star Wars Battlefront II
TF2
Audiosurf
Fable: The Lost Chapters
Fiesta
Cabal
Flyff
Starcraft (OMG, I can't wait until I get my hands on 2)
Those are all the video games I own off the top of my head. I think there are *many* more that I skipped.