Quite a lengthy procedure, hopefully better tools will come out.
http://wii.ds-scene.net/?s=viewtopic&id=508#3
A few pre made roms have appeared already
Emerald.Dragon.VC.REGIONFREE.Wii-BLACKCATS
Chrono Trigger Virtual Console -xdeadxpoolx-
and more, not sure if they're on the NGs yet.
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