In order of purchase:

Mario Kart DS
Metroid Prime: Hunters
New Super Mario Bros.
Sonic Rush
Metroid Prime Pinball
Elite Beat Agents
Drawn To Life
Zelda: Phantom Hourglass
Mario Party: DS

The next games I'll get:

Ninja Gaiden: Dragon Sword
Guitar Hero: On Tour
Sonic Chronicles: The Dark Brotherhood
and probably some others that come out in the future...