If you like Pokemon, I think the Diamond and Pearl versions are gonna be DS titles.
Also upcoming, NewSMB.
Same with you, the only DS game I have at the moment is MKDS. Wait a moment! I also have the Metroid Prime: Hunters demo. I used to have Ping Pals, but it sucked, and I sold it.
I think a Zelda DS is in the making, but that's all we know about it.