We put them on our front door next to the "save our pets" sticker so firefighters and other assorted individuals know our OS preference. It also helps keep the mormons away.
4th Floor I think. Next to all the computers (also I'm not an Edinburgh student, but I use the library a lot over my own uni's. I just about died of glee when I saw the mac minis everywhere)
That's the exact reason that I don't display them anywhere! I was going to put one on my car then I got scared someone might think theres a Mac in the boot lol I'm a bit OCD with security issues like that!