The Wiimote, Classic Controller, and Wavebird are fine for playing Virtual Console games, but they're still missing something. Maybe it's the lack of wireless, maybe it's the stark white plastic, maybe it's the slightly awkward button placement, but these controllers just can't be the best choice for playing classic NES and Super Nintendo games.
Controller-modding company RetroZone is now selling NES and SNES controller adapters for the Nintendo Wii. One end goes into the Wii's GameCube port and the other connects to the classic rectangle or dogbone controller. You still need the original decades-old controllers, and you'll be tethered to your Wii, but at least you'll be playing Legend of Zelda: A Link to the Past and Super Mario Bros. the way they were meant to be played.
Video game purists of the world unite! You have nothing to lose but about $25 each when these adapters go on sale next month.