GameSpot has compiled a list of all the games for the Gamecube. Here it is:
Acclaim
18 Wheeler: American Pro Trucker – 2001
All-Star Baseball 2002 & 2003 – 2001/2002
Crazy Taxi – 2001
Dave Mirra Freestyle BMX 2 – 2002
Extreme-G 3 – November 2001
Jeremy McGrath Supercross World – 2002
Legends of Wrestling – 2001
NFL Quarterback Club 2002 – 2001
Turok Evolution – 2002Activision
Spider-Man Movie – 2002
Tony Hawk’s Pro Skater 3 – 2003Bam
Powerpuff Girls – 2002Electronic Arts
Madden NFL 2002 – 2001
SSX Extreme – 2002LucasArts
Star Wars Rogue Squadron II – 2001Midway
NFL Blitz 20-02 – 2001
NHL Hitz 20-02 – 2001Nintendo
Animal Forrest – TBA
Diddy Kong Racing – TBA
Eternal Darkness – Dec 2001
Kameo: Elements of Power – 2002
Legend of Zelda – TBA
Luigi’s Mansion – Nov 2001
Mario Kart for GameCube – TBA
Metroid Prime – TBA
Mickey for GameCube – TBA
NBA Courtside 2002 – Nov 2001
Pikmin – Dec 2001
Raven Blade – 2002
StarFox Adventures: Dinosaur Planet – Nov 2001
Super Smash Bros. Melee – Nov 2001
Waverace Blue Storm – 2001Sega
Monkey Ball – 2002
Phantasy Star Online Ver. 2 – 2001THQ
Hot Wheels (working title) – 2002
Jimmy Neutron Boy Genius – 2002
Rugrats (working title) – 2002
Scooby-Doo (working title) – 2002
Tetris Worlds – 2002UbiSoft
Batman – 2001
Donald Duck – 2002
Largo Winch – 2002
Rogue Spear – 2001
Rayman Tribe – 2002
Rally Simulation – 2002
Tarzan – 2002
Looks like it is being supported a lot more than people thought.