I ordered a decal from decalgirl.com and just got it today.
It was surprisingly easy to apply. The instructions say to have a friend help apply the main decal on the lid of the mini to make sure it's even, but doing it yourself isn't too difficult.
The surprising thing is that it has overlays around the keyboard, and it goes over the trackpad too. Doesn't seem to affect the trackpad use.
The vinyl doesn't show fingerprints like the glossy finish of the lid did.
Those of you who installed OSX, you just have to get a skin (this site or another) to further impress people...