Apparently Luigi - the better of the two Mario Bros. - is playable in Super Mario Galaxy. I have been waiting for this day since Super Mario 64. A 3D Mario platformer where Luigi gets to shine. :)

I’m so happy. The past two years have been good to Luigi. First, New Super Mario Bros. puts Luigi in his first side-scrolling adventure in sixteen years, and then Super Mario Galaxy puts him in his first ever 3D platformer.