Perhaps I am reading this wrong, but SDLMAME works fine on the N900. In fact, this is the first phone sized device I have tried that actually is running a newer romset. All other MAME versions use the old 034/035 romsets. The N900 with SDLMAME has the potential of running a LOT more games. It already does now. Just needs improvements with NeoGeo and few others sets, but Flandry is working on ways to make the emu more efficient down the road.

CPS2 would be a nice bridge if someone could get a GUI like SDLMAME has and install process like it as well. Terminal commands are so DOS and will limit community adoption of it.

If this is the FInal Burn version, it should also run NeoGeo games too. That would be nice, since Final Burn works better on these type of devices for those games, CPS2 and Cave as well.

UPDATE:

SDLMAME has loaded and played almost every game I have tried. After trying hundreds of games, it plays about 60% of them smooth with sound. Another 10% play well with frame adjustments. 70% rate with a full 135 romset is already tons more games than the entire 034/035b set.