What about arcade emulation.
Ths PSP already does NEO, CPS1 and CPS2 pretty well. So the 3DS should handle those.
The PSP had shocking frame rates with CPS3 so that would be interesting as would Tatio Type X and X2.
Then there is the sega dreamcast emulator which would be interesting.
PC emulation would also be cool. The DS can already handle some basic X86 games.
Ths PSP already does NEO, CPS1 and CPS2 pretty well. So the 3DS should handle those.
The PSP had shocking frame rates with CPS3 so that would be interesting as would Tatio Type X and X2.
Then there is the sega dreamcast emulator which would be interesting.
PC emulation would also be cool. The DS can already handle some basic X86 games.