Nintendo have announced the 3DS Virtual Console, while will allow players to purchase "Gameboy and Gameboy Advance" titles from Nintendo's heaving back catalogue. No word yet on whether the range of titles will extend beyond those two platforms - but there's no technical reason why it couldn't. Nintendo's Virtual Console on Wii offers titles from the NES, SNES and N64, as well as SEGA's Master System, Mega Drive, NEC's TurboGrafx-16 and TurboGrafx-CD, SNK's Neo Geo AES and the Commodore 64.
Further details have yet to be revealed, but imagine how amazing C64's Nebulus would look in 3D - get on it, Nintendo.