Careful with Neutopia though; atm you've got to use the password system as save doesn't work (although if someone's GOT it to work, I'd be very pleased).
For SMS/GG emu, there's Phantasy Star, and PS Gaiden. Also thins like Ys, Ultima 4, Golvellius, A Sylvan Tale (needs a translation), and Defenders of Oasis.
Obviously there's SCUMM stuff, and possibly (not sure) the early Quest for Glories (try them on Sarien).
SNES... I don't find much playable yet on it. Gameboy, there's too many to speak of, although not all of them are said to read the save-games. Most do, though.