This has every Pikmin site you could think of and information on the sites. I haven't found any just on Pikmin, so if you know ones I can put on, e-mail me.

Official Sites
Nintendo At E3 Has info, lots of screenshots for Pikmin.
Official Pikmin Site Not good. Only has SpaceForce thing.

Other Luigi's mansion Sites
There aren't any I could find. Please tell me one. Just e-mail me at theboss@gamecubestation.20m.com