I'm pretty convinced that the DS is the best game console ever made. My collection kinda speaks for itself, especially considering that I'm missing a few good games still...
Advance Wars: Days of Ruin
Advance Wars: Dual Strike
Apollo Justice: Ace Attorney
Animal Crossing: Wild World (x2)
Bangai-o Spirits
Castlevania: Dawn of Sorrow
Castlevania: Order of Ecclesia
Castlevania: Portrait of Ruin
Children of Mana (x2)
Chrono Trigger
Contra 4
Dementium: The Ward
Dragon Quest Heroes: Rocket Slime
Dragon Quest IV: Chapters of the Chosen
Dragon Quest V: Hand of the Heavenly Bride
Electroplankton
Elite Beat Agents
Final Fantasy Fables: Chocobo Tales
Final Fantasy Tactics A2: Grimoire of the Rift
Fire Emblem: Shadow Dragon
Game & Watch Collection
Grand Theft Auto: Chinatown Wars
Hotel Dusk: Room 215
Insecticide
Jake Hunter: Detective Story Memories of the Past
Kirby Canvas Curse
Kirby Super Star Ultra
Konami Classic Series: Arcade Hits
Lifesigns: Surgical Unit
Magical Starsign
Mario & Luigi: Bowser's Inside Story
Mario Kart DS (x2)
Mario Party DS
Meteos
Metroid Prime Hunters (x2)
Miles Edgeworth: Ace Attorney Investigations
Moon
Ninja Gaiden: Dragon Sword
Nintendogs
New Super Mario Bros.
Pac-Pix
Phoenix Wright: Ace Attorney
Phoenix Wright: Ace Attorney Justice For All
Phoenix Wright: Ace Attorney Trials and Tribulations
Picross DS
Pokemon Diamond
Pokemon Pearl
Polarium
Professor Layton and the Curious Village
Professor Layton and the Diabolical Box
Retro Game Challenge
Scribblenauts
Scurge: Hive
Sonic Rush
Soul Bubbles
Star Fox Command
Super Mario 64 DS
Super Princess Peach
The Legend of Zelda: Phantom Hourglass
The World Ends With You
Trace Memory
Trauma Center: Under the Knife 2
Viewtiful Joe: Double Trouble
Warioware: Touched!
Yoshi
Advance Wars: Days of Ruin
Advance Wars: Dual Strike
Apollo Justice: Ace Attorney
Animal Crossing: Wild World (x2)
Bangai-o Spirits
Castlevania: Dawn of Sorrow
Castlevania: Order of Ecclesia
Castlevania: Portrait of Ruin
Children of Mana (x2)
Chrono Trigger
Contra 4
Dementium: The Ward
Dragon Quest Heroes: Rocket Slime
Dragon Quest IV: Chapters of the Chosen
Dragon Quest V: Hand of the Heavenly Bride
Electroplankton
Elite Beat Agents
Final Fantasy Fables: Chocobo Tales
Final Fantasy Tactics A2: Grimoire of the Rift
Fire Emblem: Shadow Dragon
Game & Watch Collection
Grand Theft Auto: Chinatown Wars
Hotel Dusk: Room 215
Insecticide
Jake Hunter: Detective Story Memories of the Past
Kirby Canvas Curse
Kirby Super Star Ultra
Konami Classic Series: Arcade Hits
Lifesigns: Surgical Unit
Magical Starsign
Mario & Luigi: Bowser's Inside Story
Mario Kart DS (x2)
Mario Party DS
Meteos
Metroid Prime Hunters (x2)
Miles Edgeworth: Ace Attorney Investigations
Moon
Ninja Gaiden: Dragon Sword
Nintendogs
New Super Mario Bros.
Pac-Pix
Phoenix Wright: Ace Attorney
Phoenix Wright: Ace Attorney Justice For All
Phoenix Wright: Ace Attorney Trials and Tribulations
Picross DS
Pokemon Diamond
Pokemon Pearl
Polarium
Professor Layton and the Curious Village
Professor Layton and the Diabolical Box
Retro Game Challenge
Scribblenauts
Scurge: Hive
Sonic Rush
Soul Bubbles
Star Fox Command
Super Mario 64 DS
Super Princess Peach
The Legend of Zelda: Phantom Hourglass
The World Ends With You
Trace Memory
Trauma Center: Under the Knife 2
Viewtiful Joe: Double Trouble
Warioware: Touched!
Yoshi