Not sure if there was a thread on this previously but if there was I could not find it.
I have a wii but still play my fair share of Gamecube software

the ones I own are

StarFox Adventures
Metroid Prime
Metroid Prime 2: Echoes
Legend Of Zelda: The Wind Waker
Soul Calibur II
Super Smash Bros: Melee
Phantasy Star Online Episode I & II

ugh i hate to post them all cause i have it in my 'games i own' section aswell..well to compare it with your games, i got LoZ WW, SSBM and PSO 1&2 aswell

Metroid Prime
Wind Waker
Resident Evil 4
True Crime: Streets of LA
Tales of Symphonia
Summoner: A Goddess Reborn
Viewtiful Joe
Call of Duty 2: The Big Red One
Naruto: Clash of Ninja
Dinotopia

Nintendo GameCube games

Battalion Wars
Eternal Darkness: Sanity's Requiem
Fire Emblem: Path of Radiance
F-Zero GX
Kirby Air Ride
Legend of Zelda: Collector's Edition
Legend of Zelda: Four Swords Adventures
Legend of Zelda: Ocarina of Time/Master Quest
Legend of Zelda: Twilight Princess
Legend of Zelda: Wind Waker
Lego Star Wars
Mario Kart: Double Dash!!
Metal Gear Solid: The Twin Snakes
Metroid Prime
Metroid Prime 2: Echoes
Paper Mario: The Thousand-Year Door
Pokemon Colosseum
Resident Evil 4
Sonic Adventure DX: Director's Cut
Soul Calibur II
Star Fox Adventures
Star Fox Assault
Star Wars Rogue Squadron III: Rebel Strike
Super Mario Sunshine
Super Smash Bros. Melee
Tales of Symphonia

All of them, exept for the Tales game and Skys of whetever game. I can't find those two anywhere.

we own eleven but my fav is melee i dont feel like listing and bacon got a game from his friend.

  Sorry I was looking for it but could not find it

I have a lot of them. Thank God for used games. Wouldn't have been able to get a lot of these. I've picked up 8 in the last year that way.
007 Everything or Nothing
Animal Crossing
Battalion Wars
Eternal Darkness: Sanity's Requiem
Goldeneye: Rogue Agent
Incredibles: Rise of the Underminer (Little Brother's)
Legend of Zelda: The Windwaker
Lego Star Wars (also little brother's)
Luigi's Mansion
Madden NFL 06
Madden NFL 07
MLB 2K6
Metroid Prime
NBA Live 2005
Phantasy Star Online Episodes 1 and 2
Pikmin
Pikmin 2
Resident Evil
Scooby Doo! Unmasked (Little Brother's Again)
Shadow the Hedgehog
Simpsons Hit and Run
Sonic Adventure 2: Battle
Starfox Adventures
Spongebob Square Pants: Battle for Bikini Bottom (Again, not mine)
Star Wars Rogue Squadron 2: Rogue Leader
Super Mario Sunshine
Super Smash Brothers Melee
Viewtiful Joe

Animal Crossing
Metroid Prime
Pikmin
Legend of zelda Wind Waker
Lost Kingdoms
Sonic Adventure 2 Battle
Star Fox Adventures
Need For Speed:underground
Spiderman 2
Viewtiful Joe
Soul Calibur II
Super Smash Bros. Melee
Resident Evil 4

Seems to be 54.