i think i found NGP secret feature that sony don't tell.
you can connect NGP with ps3 via Bluetooth (or specialized hardware) so that you can play Ps3 game with NGP as controller (bare in mind you can use back touch pad as r2/l2).
another interesting tidbit is that you can upscale NGP game via ps3 to TV so that you can play NGP game on HDTV.
another one is that you can allow NGP player to play with PS3 player (and probably sony xperia play and other playstation suite hardware like rumored
sony tablet ) TOGETHER in SAME GAME!.
how does it sound?