I posted a review of the skin process a while ago. I'm really happy with my skin, and to this day it still looks great on my Wii.
In case you missed it here is my hands on review of the Nintendo Wii Skinning process:
Nintendo Wii Skins from decalgirl to make sure that my visitors were not getting ripped off.
I have to say that I'm very impressed with the quality and the simplicity of applying a skin to my Wii.
I took pictures of the process, which reminded me of those things called 'Colorforms' that i used to play with when I was a kid. The decals come printed out on a sheet already precut to fit the wii perfectly. All of the notches lined up without a problem. The decal is sticky but not THAT sticky, meaning if you mess up, you can easily peel it off and start over.
I applied the pieces one by one to the Wii, then
Since it's basically just a big sticker, you do not have to open your wii, or void the warantee to install these. No tools were necessary, just some stable hands and some time.
Order your Wii Skins Here.