I don't have many DS games, and don't use it that much either. I bought Tetris, Mario Kart and Animal Crossing in the first week I had it, and Elite Beat Agents, Electroplankton and Ouendan later on (all £5 each).
When I do occasionally use the DS, it'll be for Tetris or Elite Beats/Ouendan. Mario Kart didn't take long to complete to death (and wifi has too many cheaters / quitters to make it worthwhile) and I got tired of Animal Crossing - after I collected nearly all the things, there was nothing else to do. I'm sure my place is a cockroach ridden, weed-filled craphole by now. :)
I used to have Starfox Command (so disappointing) Sonic Rush (not bad, aside from the shitty bosses of tedium) and Bleach: The Blade of Fate. I gave the first 2 away, and don't know what happened to Bleach. :/
So... yeah.

