A blogger tallied up the various exclusive titles between the three. Observe.
360 Exclusives
Microsoft
Alan Wake
Banjo-Kazooie
Blue Dragon
Crackdown
Fable 2
Forza Motorsport 2
Fuzion Frenzy 2
Gears of War
Halo 3
Halo Wars
Infinite Undiscovery
Kameo: Elements of Power
Lost Odyssey
Marvel Universe Online
Mass Effect
Ninety-Nine Nights
Perfect Dark Zero
Project Gotham Racing 3
Project Gotham Racing 4
Shadowrun
Too Human
Viva Piñata
Xbox Live Arcade Unplugged Volume 1
2K
Amped 3
BioShock
AQ Interactive
Cry On
Atari
Bullet Witch
Capcom
Dead Rising
Lost Planet: Extreme Condition
Codemasters
Overlord
Eidos
Battlestations: Midway
Crossfire
Kane and Lynch: Dead Men
Electronic Arts
FIFA 2007 (for next generation consoles)
Konami
Dance Dance Revolution Universe
Rumble Roses XX
Namco Bandai
Mobile Ops: The One Year War
Ridge Racer 6
Rockstar
Rockstar Games Presents Table Tennis
Sega
Chromehounds
Square-Enix
Project Sylpheed
Tecmo
Dead or Alive 4
Dead or Alive Xtreme 2
THQ
MotoGP ‘06
Saints Row
Ubisoft
Naruto (working title)
Over G Fighters
Tom Clancy’s Splinter Cell 5
PS3 Exclusives
Sony
Afrika
Eight Days
Fomula One 06
Genji: Days of the Blade
Gran Turismo HD
Heavenly Sword
Hot Shots Golf
Jak and Daxter: The Lost Frontier
Killzone
Lair
MotorStorm
Monster Kingdom: Unknown Realms
My Summer Vacation
Resistance: Fall of Man
Singstar
The Eye of Judgement
Warhawk
White Knight Story
Sony Online Entertainment
DC Universe
Untold Legends: Dark Kingdom
Capcom
Devil May Cry 4
Koei
Bladestorm: The Hundred Years War
Fatal Inertia
Konami
Metal Gear Solid 4: Guns of the Patriots
Namco Bandai
Mobile Suit Gundam: Crossfire
Ridge Racer 7
Tekken 6
Rockstar
L.A. Noire
Sega
Fifth Phantom Saga
Full Auto 2: Battlelines
Miyasato Miyoshi Kyoudai Naizou: Sega Golf Club
Virtua Fighter 5
Square-Enix
Final Fantasy XIII
Final Fantasy Versus XIII
Taito
Railfan
Wii Exclusives
Nintendo
Battalion Wars 2 / BWii2
Disaster: Day of Crisis
Excite Truck
Fire Emblem: Goddess of Dawn
Forever Blue
Hajimete no Wii: Your First Step To Wii
Mario Strikers Charged
Metroid Prime 3: Corruption
Pokemon Battle Revolution
Project H.A.M.M.E.R.
Super Smash Bros. Brawl
Super Mario Galaxy
Wario Ware: Smooth Moves
Wii Motor Sports Airplane
Wii Sports
Activision
Rapala Trophies
Tony Hawk’s Downhill Jam
Atlus
Tramua Center: Second Opinion
Banpresto
Crayon Shin-Chan: Saikyou Kazoku Kasukabe King
Hudson
Kororinpa
Sky Workers
Koei
Samurai Warriors Wave
Konami
Elebits
Majesco
Bust-a-Move Revolution
Namco Bandai
Ennichi no Tatsujin
One Piece: Unlimited Adventure
SD Gundam: Scud Hammer
Tamagotchi no Pika Pika Daito-ryo-!
Nibris
Sadness
Sega
Bleach: Wii Shiraha Kirameku Rinbukyoku
Sonic and the Secret Rings
Super Monkey Ball: Banana Blitz
Spike
Heroes
Necro-Nesia
Square-Enix
Dragon Quest Swords: The Masked Queen and the Tower of Mirrors
Final Fantasy Crystal Chronicles: Crystal Bearers
Taito
Cooking Mama
Tecmo
Swing Golf Pangya
Tomy
Naruto: Geiktou Ninja Taisen Series
Ubisoft
Red Steel
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As you can see, they are all pretty close in sheer numbers, particularly if you account for the 360s year head start. Discuss.