I doubt that it was damaged since you've only left it on that long once. Otherwise, they wouldn't be worth the money. I think the biggest concern with leaving a console on for a long time is not console damage but fire hazard. However, the Wii shouldn't have a problem with causing a fire. I'd think that Nintendo would already have thought of people accidentally leaving their systems on. It was the original XBox that had a problem with fire hazards, but that was fixed with using a different kind of power plug.

__________________
Anything good in life is either illegal, immoral, or fattening. - Murphy's Law