Joystiq is reporting that Super Mario Galaxy has sold a half million units in the US during it’s first week at retail! According to the article, ‘Super Mario Galaxy the strongest first week sales of any Mario game ever.’

For those that dont know:
Super Mario Galaxy is a 3D action-platformer game developed by Nintendo EAD Tokyo and published by Nintendo for the Wii. It is the third 3D platformer in the series after Super Mario 64 and Super Mario Sunshine. The game follows Mario on his quest through space to save Princess Peach from his nemesis Bowser. Levels take the form of galaxies filled with spherical planetoids, while gameplay is updated with a variety of gravity effects and new power-ups.