I packed up my Wii for a move recently, and I noticed that there are all these little marks on its surface. It's the side that would be the "bottom" if the Wii is horizontal, or the "left side" if the Wii is in the vertical stand.
There are also marks on the "top"/"right side," but fewer.
They're most visible under a light. They're not dark -- they're white, but they're just weird textural differences. Maybe caused by heat? I don't know.
If any of you have the chance, could you check your Wiis and see if you have a similar phenomenon? I'm just curious if I'm alone with this.