Old school SNES controller for the Wii
Like the Wii's Classic Controller, this controller plugs into the bottom of the Wiimote, which allows it to establish a wireless connection to the console itself. Unlike the Classic Controller, though, it doesn't look absolutely hideous. Just make sure that none of the Virtual Console games you own require more than six buttons.
Unboxing Shots of the SNES Classic Controller [Inside Games]

the latest
latest episodes

i love snes enough that even though i dont own a wii, i need this.
Controller that plugs into another controller = super fail, whether it's classic or SNES style.
They aren't wireless because they plug into the Gamecube ports, but here are some adapters to plug your original NES or SNES controllers into the Wii:
http://www.retrousb.com/index.php?categoryID=80
I bought one to play Metroid and Super Mario Brothers with an original NES controller and it works great.