I bought my girlfriend a ds and I find myself playing it a lot also. She gets some of those shovelware games and to be honest all of the ones that she has bought I believe are really fun. There are a lot of fun games that can be had for the ds. It will be a great purchase for you and if you like rpgs there are some good titles also that you can pick up. Go ahead and pull the trigger and buy.
End of 2009 sales predictions:
PS3 - 33 Million 360 - 40 Million Wii - 75 Million