Simon Kagstrom has released a new Commodore 64 emulator for the Nintendo Wii. Although it appears it doesn't support a keyboard you can map key combinations to the various buttons on the Wiimote.
Put .t64 or .d64 in /apps/frodo/images on your SD card.
Press "Home" on the controller to get to a menu where you can insert tapes/disks and configure the emulation.
Key 2 on the controller is fire and the other keys (except direction keys) can be programmed to output keyboard keys.
Thanks go to
* Christian Bauer for the original Frodo
* Wii/Gamecube SDL port for the graphics
* "Tantric"'s port of FCE Ultra, which the sound support was taken from (a bit modified)