Ars Technica notes that, as more information leaks out from a recent Nintendo event, the control scheme for Smash Bros. on the Wii is now available for your examination. You're pretty much going to want to use the 'classic' controller for this one:
"Holding the remote sideways like an NES controller, the d-pad is used for movement, A is used for taunting, B for guarding, the minus button for grabbing, the 1 button for special moves, the 2 button for the standard attack, and a combination of buttons for the "Smash Attack" ultimate moves." http://games.slashdot.org/article.pl.../10/19/1852257