3D Classics: Twinbee Colors! 3D Dead or Alive Dimensions Deer Drive Legends 3D Dream Trigger 3D Kid Icarus Uprising Kingdom Hearts: Dream Drop Distance Legend of Zelda: Ocarina of Time 3DS Mario Kart 7 New Super Mario Brothers Outdoors Unleashed! Africa Pilotwings Resort Resident Evil: Revelations Ridge Racer 3D Spirit Camera: The Cursed Memoir Star Fox 64 Super Mario 3D Land Super Street Fighter IV: 3D Edition Thor: God of Thunder VC: Donkey Kong (GB/1994) VC: The Legend of Zelda
I have two right now, but that's mostly because I only got my 3DS last month because of a pile of discounts and sales shortly before Christmas. I got the bundle that came with Super Mario 3D Land preloaded, and I just picked up Ocarina of Time 3D a few days ago. Haven't had much time to play it yet, but I'm absolutely loving how they handled Zelda so far. Mario 3D Land has been an interesting change of pace as well.
I guess technically I also have the original GameBoy Tetris from the current Club Nintendo download, but I don't really consider that a 3DS game.