lemme see...
Borderlands 2, NHL09, Pokemon Diamond, Tetris DS, SSBB, Dishonored, SA:MP, Shootmania (it's in open beta right now), Scribblenauts Unlimited, Bastion, Croc: Legend of the Gobbos, SSBM, Mario Kart DS and probably some other random games
I am not a man that plays only one game at a time (unless it's one heck of a great game. Last time that happened was with Xenoblade Chronicles and The Last Story)