I found this while searching for the magazine chain "Which?'s" website.
Which OS Are You?
Basically you're led through typical questions that test your character, and I assume (I'm still doing it myself) you'll be compared to ermm...an operating system, such as Windows or Linux.
Give it a try, and tell us what you get.
EDIT - Classic.
http://bbspot.com/Images/News_Featur..._quiz/os_x.jpg