ok so i got my hands on the newest pop'n music portable for the PSP - so far it seems very nice. 5 7 and 9 key modes, and the control scheme works very well for the buttons. about 80 songs total, must unlock a few of them via adventure mode (think like DDR home-console "tour" mode lol)
and its not bad setup, so if you like this series, give it a try for your PSP.
[news via Bemanistyle][Official site (if you can ready japanese)]{buy at PlayAsia}
Ya im good...ya i just beat you on Trip Machine Climax on DDR-GB3....no i dont have a life T_T