Like I have said before, I say again:
Nintendo must advertise the NDS handheld, and in those adverts show people why it is so much better than the usual coming on the PSP. Sony´s darn good at advertising, and to make things look stylish through it. Nintendo must make clear why their machine is more fun, and just as stylish as the PSP! For instance, they could show how the WiFi functionality makes it fun to have friends far away, playing with them. Or to demonstrate how easily people can link up with oneanother and go multiplayer entirely wireless! But most important of all is - the games! The absolutely best and most entertaining games only must be shown, and one way to find out which ones they are, is through sitting people from a large segment of the gaming population down with the DS games and test the "fun yield factor" with each, until you have a clear score for each which will tell which ones are the clear winners. Then use those in the tv-ads, and bang! there you go! People who see them will beg, steal, borrow the money to get an NDS and get to play!
Then I don´t see how they could ever fail! I trust that the NDS will take Nintendo quite far, but perhaps not right away. People will have to get used to it first, and that´s why I think it is very important that NDS tv-ads are kept running regularly! In the past, Nintendo has been very poor at communicating by itself through the media for lack of proper advertising. Doing it right this time, should ensure that people will indeed see who they are!