Well I think they work in Australia, not sure.
whenever you buy a Nintendo game over there do you get a slip of paper in the game case which has a scratch off panel?
If so then you can join Club Nintendo (go to www.ninendo.co.uk) and give these codes to add stars to your account.
That feature has been around since the Gamecube was launched, but the only things the stars were useful for was to get nintendo wallpapers for your desktop, or if you had an insane amount of stars you might be able to get a t-shirt.
Now though you can link the account to your Wii points account, and buy Wii poins with the stars, which involves being on the site at the right time (which is probably mid morning for Aussies) then you get a code given similar to that on a normal store bought Wii points card.. enter that into the shop channel and voila.
The annoying thing is I had a GameCube and 14 games which I think all had these slips in, but due to the lack of proper incentive I threw them all away... so many stars lost.
