there was a link on the main page a week back detailing how to change the region on your wii. give it a go. I haven't had to do it yet so I can't help you further.
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Duke
Official Reseller of D2Sun/WiiZard/D2Ckey/Wasabi/Argon/D2pro www.mad-mods.com
Switching from Jap to NTSC I can confirm works but PAL to NTSC I hope will work. The method isnt exactly safe and could cause a bricked wii if not done properly.
Perhaps if you find a buyer back in Australia and want to buy a new wii you can contact us for a premodded NTSC -U system
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I changed a JAP wii into a PAL wii and all went well. So changing to and from any region is possible. Follow this tutorial and you can't go far wrong...