Best Year Ever: Nintendo

[Jumpin]

2007, if you include the bit at the end of 2006:
Wii launch
Wii Sports
Legend of Zelda: Twilight Princess
Wario Ware Smooth Moves
Pokemon Diamond and Pearl
Metroid Prime 3
Fire Emblem: Radiant Dawn
The World Ends with You
Revenant Wings
Ring of Fates
Super Paper Mario
Super Mario Galaxy
Nintendo Virtual Console
Diddy Kong Racing DS
Hotel Dusk
FF Tactics A2
Dragon Quest 4
Final Fantasy IV
Dragon Quest Monsters: Joker
Trauma Center
Phoenix Wright Ace Attorney 2
Umbrella Chronicles
Zack and Wiki
Battalion Wars 2
No More Heroes
NiGHTS: Journey of Dreams

And 2008 is a lot better than the other years listed as well:
Chrono Trigger DS
Phoenix Wright Acr Attorney: Trials and Tribulations
Smash Brothers Brawl
Endless Ocean
Super Mario Kart 6
Wii Fit
Disaster Day of Crisis
Animal Crossing City Folk
Dragon Quest 5
Valkyrie Profile
Pokemon Platinum
Professor Layton
Advance Wars: DoR
World of Goo
Fire Emblem: Shadow Dragon
Kirby Superstar Ultra
Disgaea DS
Castlevania: Order of Ecclesia
Rune Factory 2
Boom Blox (surprisingly fun)
Rock Band 2, Guitar Hero, etc... (Multiplat, but the Wii versions were the definitive versions everyone got)
Tiger Woods PGA Wii version
Mega Man 9
GRID
Civilization Revolution