Mario DS
I got this as the first game for the DS. Overall, I am fairly impressed with how much stuff is packed in it.
Meteos
I heard this game was pretty good right here in Planet GameCube Forums, and upon research, found out it was indeed pretty good. Now after playing it, I say it's freaking awesome. My only complaint is that you can win just by randomly doodling around on the touch screen real fast.
Animal Crossing DS (Recently Sold)
I was horribly dissapointed with Animal Crossing: Wild World, mostly because I was expecting a sequel. Wild World is basically a port, with the only redeeming value that you can play on-line with a friend. Although this is great, it just wasn't new enough to me to keep my interest.
Mario Kart DS
I am absolutely astounded with how well this game was built. All the itty bitty details throughout the entire game just shows how much polish Nintendo put into this rendition of Mario Kart. I'd have to say that this Mario Kart's physics rival even those of Mario Kart 64's in terms of most fun. My only complaint is that when you smash into a wall, you're just stopped, there's no real attempt to create realistic wall kinetics.
I love the single player, I love the multiplayer, this game is a great buy.
Metriod Prime: Hunters
Unfortunately I havent gotten too far into the game yet, and mostly only played multiplayer(WFC/ against AI) when I could. I am thoroughly impressed with the graphics and gameplay, and the single-player doesnt do too bad of a job of being a good game in itself. I'd probably find MP:H a lot more fun if I could actually play with more than one person, and even better yet, speak with them, but oh well. Deffinitly a great game.