Although the source marks this as a rumor, I have read various confirmations therefore I think that it’s safe to assume that this really works. All you need is an NTSC Gamecube game.

Pop a PAL GameCube disc into the Wii, and head to the ‘Disc Channel’. A GameCube logo should be up on the screen. Point the Wii Remote’s cursor over the ‘Start’ option so it’s highlighted, and while keeping your hand steady, press the eject button on the Wii. For about one second, the ‘Start’ option will remain active. In this window of time, hit the A button on the Wii Remote and then swap out your ejected PAL GCN disc with an NTSC (Japanese or USA) disc, which the Wii will accept into the drive.

Yeah… unfortunately Wii owners need to apply special hacks in order to get their imported games running on their systems, but I’m surprised that Nintendo let this mistake slip. Just remember to be careful before updating your Wii to the latest firmware next time, as it will probably fix this.