I've shown you how to make a wireless NES controller for your Wii, but if you were more of a Sega fan back in the day, I've got a new one for you.
The guys over at Cre.ations have converted an old Sega Genesis controller so that it will work with your Wii. This one is definitely not for the feint of heart.
In then end, you've got yourself a fully-functional Sega Genesis controller that Sonic would be proud of.
Genesis Controller Wii VC [via kotaku]