This game works well on DS and is perfect for holidays and the like. Essentially it plays like the real game, although it seems easier to input seemingly made-up words (ie, I entered the letters "IP" and it registered as a word") so younger players could cheat themselves if they don't understand the meaning.
Also, the music, while fairly nice to listen to initially, can start to grate after a while.
The touch screen is used to great effect for this game and really, the DS is the perfect platform for Scrabble. It's a game I recommend :)