I've lost interest in some of my DS games, but I still go back and play a lot of them. I still play Mario Kart a lot, I've played through Canvas Curse a couple times, Warioware occasionally, I'm playing through Mario and Luigi: PiT again, and Ossu, Tatake, Ouendan! gets better every time I play it. The only games I've really gotten into though since the DS's launch are Super Mario 64 DS and Mario Kart. Both of which I've put 80+ hours into.