Nintendo DS Free Games

I just received a Nintendo DS as a gift. I really didn't expect it but I'm glad that I did. Now I can stop playing games in my cellphone. But first, I have to find free Nintendo DS games download online so I can play with it. I heard that Cooking Mama is one of the most popular games for the Nintendo DS so I'm starting with that search. I know that I will really enjoy my new toy. This will surely take away my boredom.