Once your Wii is connected to the 'net, go to the Wii Shop Channel in the Wii Virtual Console and you'll find it full of classic console games that download to your system for a fee.
Games include titles from the SEGA Genesis, TurboGrafx-16, TurboGrafx-CD, Neo-Geo, Nintendo Entertainment System, Super Nintendo and the Nintendo 64. To play these games you'll need a GameCube controller or a Wii Classic Controller.
Below are titles A through F.
For more games check out Part 2 - Titles G through Z.
Comix Zone
Original Platform: SEGA GenesisPublisher: SEGA
Developer: SEGA
Original Release Date: 01/01/1995
ESRB Rating: E for Everyone
Contra III: The Alien Wars
Original Platform: Super NintendoPublisher: Konami
Developer: Konami
Original Release Date: 4/1992
ESRB Rating: E+10 for Everyone 10 and older
Cratermaze
Original Platform: TurboGrafx-16Publisher: Hudson Soft
Developer: Hudson Soft
Original Release Date: 1990
ESRB Rating: E for Everyone
Cruis'n USA
Original Platform: N64Publisher: Nintendo
Developer: Midway
Original Release Date: 1996
ESRB Rating: E for Everyone
Cybernator
Original Platform: Super NintendoPublisher: Nintendo / Konami
Developer: NCS
Original Release Date: 1993
ESRB Rating: E+10 for Everyone 10 and older
Dead Moon
Original Platform: TurboGrafx-16Publisher: Natsume
Developer: Natsume
Original Release Date: 1991
ESRB Rating: E for Everyone
Detana!! Twinbee
Original Platform: TurboGrafx-16Publisher: Konami
Developer: Konami
Original Release Date: 02/1992
ESRB Rating: TBD
Devil's Crush
Original Platform: TurboGrafx-16Publisher: Hudson Soft
Developer: Compile
Original Release Date: 1990
ESRB Rating: E for Everyone
Dig Dug
Original Platform: Nintendo Entertainment SystemPublisher: Namco
Developer: Namco Bandai
Original Release Date: 1982
ESRB Rating: E for Everyone
Digital Champ Battle Boxing
Original Platform: TurboGrafx-16Publisher: Naxat Soft
Developer: Naxat Soft
Original Release Date: 10/1989
ESRB Rating: E+10 for Everyone 10 and older

