Nintendo:
- The Legend of Zelda
- Super Mario (3D)
- Mario Kart
(followed by [in no particular order]: Mario & Luigi, Metroid Prime, Fire Emblem, Paper Mario, Pikmin, Endless Ocean, Baten Kaitos, Kirby, Golden Sun, Earthbound, Xenoblade/X-RPG, Advance Wars, Wave Race, F-Zero, SSB, Pokémon)
Microsoft:
- Age of Empires
- Freelancer
- Lost Odyssey
(all three are most probably dead and gone forever [AoE Online doesn't count];
the future MS IP with the most potential imo: Project Spark)
Sony:
- ICO/Shadow of the Colossus
- (none)
- (none)
(even though I own a PS3 and PSP, and even though one of my most favorite games of last gen was an exclusive PS3 game [but not an IP owned by Sony afaik], Sony rarely creates IPs I care about)








