Zoo Keeper - simple puzzler but superb use of the stylus.
Tony Hawks - truly excellent gfx and gameplay. The best TH in *ages*.
Sonic Rush - awesome speed and lovely boss sections. Flawlessly polished.
Mario Kart - just about perfect in every way.
I'd say those four are the biggies. Just under those I'd add:
Yoshi Touch & Go - score attack is like crack.
Kirby - good fun and again, stylus-based controls.
Mario64 - ignore the haters. Excellent main game, fun minigames.
Meteos - intense short-blast puzzler. Brain meltingly chaotic.
Advance Wars - just brilliant strategy, a good session game.
Under the Knife - only played briefly but it was INSANE.
Castlevania - just *playable*.
Nintendogs and Electroplankton are options but I think both are more 'interesting toys' than proper games. I like 'em both and am still making weird sounds with 'plankton.
It's the only racing game where I'm not continually smashing into corners. The powerup system is a bit noticeable, it'd be nice if you couldn't see the game trying to equalise out the players by giving the slow one a triple red mushroom. It makes it fair and the endings quite exciting, but it's really obvious the game is giving you a big help.
