Kirby Canvas Curse is an amazing game that game out fairly early in the DS's lifespan. The controls involve drawing little paths that Kirby will roll around on to accomplish your goals. If this seems boring, don't let it fool you as it is one of the most imaginative and innovative uses of Nintendo's touchscreen since the DS game out. As of this writing, it is hard for me to think of a DS game that pulled off something new with the touch screen so well. Unfortunately, the game is a bit short and there really aren't too many reasons to go back and replay it, but for the time you spend with it, you will enjoy every little bit.
This is a game that rolled into my heart and stayed there, and is one that DS owners should take a look at soon.