Reicast (DC) emulator works pretty well too. I'm playing Grandia II with widescreen option.
Only big downfall, is that there's no save state support. Gotta use the virtual VMU and save like back in the day.
Also DraStic (DS) emulator... although it cost a few bucks, it's hands down the best NDS emu out there. Playing the DS version of Chrono Trigger with settings to play with one hand is nice. Flavor of the day is current DQIX.
PSP emulator and games? Was thinking about doing this with Persona 3 Portable.
oh yeah, that shit works like a charm too. Can't believe we can emulate a psp on a phone lol.
I third that. PPSSPP is pretty rock solid on android. Been playing Trails in the Sky, which looks nice with the higher resolution. Although Persona isn't much my thing, it runs really well on there too.