Re: I like it!
My 3DS library (so far):
Mario Kart 7 (awesome)
Splinter Cell 3D (quite nice)
Super Star Kartz (avoid this badly-programmed awfulness)
Sonic Generations (yay nostalgia)
Starfox 3D (another nostalgia trip.. is the N64 version but stereoscopic)
Super Mario 3D Land (fun!)
F1 2011 (awesome, but better with the 3D off)
My DS library:
Dr Kawashima's Brain Training (yes, that one. Quite good if you like brainteasers.)
Mech Assault: Phantom War (a bit crap to be honest, I much prefer the PC Mechwarrior games)
Nintendo Touch Golf (as good as anything EA make)
Retro Atari Classics (yay nostalgia)
Sprung: The Dating Game (it cost me 50p.. still awful though)
Mario Kart DS (just try and beat me, I double dare you)
Tiger Woods PGA Tour 08 (see Touch Golf)
FIFA 07 (it's a football game, dunno why I bought it)
Sonic Rush (kinda fun)
Metroid Prime: Hunters (pretty good)
Tony Hawk's Downhill Jam (it needs to be more open ended, but otherwise fun)
Call of Duty 4 (yes really, on a DS, and with multiplayer too)
And then a number of 3D titles I ended up getting from the online store, like Dillon's Rolling Western (quite good variation on Tower Defense), and Rytmiks Retrobits (8 bit chip tune maker.. enjoyable).
All in all, there's quite a lot of stuff out there.