There can be no reason for you not to download ds games, especially when you consider the gaming price of each ds games. I own a ds myself and learnt that I can save lot of money in downloading ds games.
So you have bought a Nintendo DS. The next thing you will need to do is to get some games. You will not be able to enjoy the NDS you have bought if you do not have games to play.
Now if the time comes that you plan to download ds games this article could really be handy. It will show you some of the important facts on how to do it and the proper way to determne a good site from bad.