You may have missed out on the Club Nintendo T-Shirt, but don’t be discouraged as that Rayman 3D game you bought and almost forgot about includes points for your Club Nintendo account. Rayman is not the only titles, various other third party games have been reported to have the codes to help you get that free Nintendo stuff.
This information has come from many European gamers, but it is has yet to be confirmed if North America will have the same privilege. Before this such codes were only available in Nintendo developed titles, which limited the number of coins/points you could get.