In addition to Trauma Center: New Blood, Atlus has two music based games for the Nintendo DS. We talked about Draglade before, so I’ll point you to our import playtest for more details. Ontamarama is a unique game developed by Noise Factory that you play with the stylus and the microphone. I don’t know much about it, but the video over on the Japanese page gives you an idea of how it plays.
The fourth game coming out this holiday season is Touch Detective 2 ½, which Success Corp released in Japan earlier this year.